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66157031 = 196915039
BaseRepresentation
bin1111110001011…
…1100111100111
311121111010101102
43330113213213
5113414011111
610321550315
71432216433
oct374274747
9147433342
1066157031
1134386836
121a1a539b
1310924595
148b019c3
155c1c13b
hex3f179e7

66157031 has 8 divisors (see below), whose sum is σ = 69753600. Its totient is φ = 62571960.

The previous prime is 66156989. The next prime is 66157051. The reversal of 66157031 is 13075166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66157031 - 214 = 66140647 is a prime.

It is a super-2 number, since 2×661570312 = 8753505501469922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66156985 and 66157003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66157051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10610 + ... + 15648.

It is an arithmetic number, because the mean of its divisors is an integer number (8719200).

Almost surely, 266157031 is an apocalyptic number.

66157031 is the 3638-th centered decagonal number.

66157031 is a deficient number, since it is larger than the sum of its proper divisors (3596569).

66157031 is a wasteful number, since it uses less digits than its factorization.

66157031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5749.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 66157031 is about 8133.6972527873. The cubic root of 66157031 is about 404.4442532408. Note that the first 3 decimals are identical.

The spelling of 66157031 in words is "sixty-six million, one hundred fifty-seven thousand, thirty-one".

Divisors: 1 19 691 5039 13129 95741 3481949 66157031