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BaseRepresentation
bin100111011010000…
…011110110111001
31201002001112122122
4213122003312321
52323223033334
6145334331025
722245423344
oct4732036671
91632045578
10661142969
1130a21a553
121654b9a75
13a6c85b76
1463b4145b
153d09932e
hex27683db9

661142969 has 8 divisors (see below), whose sum is σ = 673391712. Its totient is φ = 648980640.

The previous prime is 661142959. The next prime is 661142987. The reversal of 661142969 is 969241166.

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 661142969 - 24 = 661142953 is a prime.

It is a super-2 number, since 2×6611429692 = 874220050916269922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (661142929) 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, 6059 + ... + 36864.

It is an arithmetic number, because the mean of its divisors is an integer number (84173964).

Almost surely, 2661142969 is an apocalyptic number.

It is an amenable number.

661142969 is a deficient number, since it is larger than the sum of its proper divisors (12248743).

661142969 is a wasteful number, since it uses less digits than its factorization.

661142969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43207.

The product of its digits is 139968, while the sum is 44.

The square root of 661142969 is about 25712.7005388388. The cubic root of 661142969 is about 871.1610732009.

The spelling of 661142969 in words is "six hundred sixty-one million, one hundred forty-two thousand, nine hundred sixty-nine".