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66681497 = 1713928219
BaseRepresentation
bin1111111001011…
…1101010011001
311122110202211002
43332113222121
5114032301442
610341114345
71436532461
oct376275231
9148422732
1066681497
1134704883
121a3b89b5
1310a7920c
148bdaba1
155cc2732
hex3f97a99

66681497 has 8 divisors (see below), whose sum is σ = 71114400. Its totient is φ = 62305344.

The previous prime is 66681493. The next prime is 66681499. The reversal of 66681497 is 79418666.

It is a happy number.

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 66681497 - 22 = 66681493 is a prime.

It is a super-2 number, since 2×666814972 = 8892844084322018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66681493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11747 + ... + 16472.

It is an arithmetic number, because the mean of its divisors is an integer number (8889300).

Almost surely, 266681497 is an apocalyptic number.

It is an amenable number.

66681497 is a deficient number, since it is larger than the sum of its proper divisors (4432903).

66681497 is a wasteful number, since it uses less digits than its factorization.

66681497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28375.

The product of its digits is 435456, while the sum is 47.

The square root of 66681497 is about 8165.8739275108. The cubic root of 66681497 is about 405.5101978366.

The spelling of 66681497 in words is "sixty-six million, six hundred eighty-one thousand, four hundred ninety-seven".

Divisors: 1 17 139 2363 28219 479723 3922441 66681497