16512011657 has 4 divisors (see below), whose sum is σ = 16577796816. Its totient is φ = 16446226500.

The previous prime is 16512011639. The next prime is 16512011687. The reversal of 16512011657 is 75611021561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16512011657 - 2²² = 16507817353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16512011687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32892203 + ... + 32892704.

It is an arithmetic number, because the mean of its divisors is an integer number (4144449204).

Almost surely, 2^16512011657 is an apocalyptic number.

It is an amenable number.

16512011657 is a deficient number, since it is larger than the sum of its proper divisors (65785159).

16512011657 is an equidigital number, since it uses as much as digits as its factorization.

16512011657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65785158.

The product of its (nonzero) digits is 12600, while the sum is 35.

The spelling of 16512011657 in words is "sixteen billion, five hundred twelve million, eleven thousand, six hundred fifty-seven".