16656510641 has 4 divisors (see below), whose sum is σ = 16667307072. Its totient is φ = 16645714212.

The previous prime is 16656510623. The next prime is 16656510643. The reversal of 16656510641 is 14601565661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 14601565661 = 30763 ⋅474647.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16656510641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16656510643) 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, 5395901 + ... + 5398986.

It is an arithmetic number, because the mean of its divisors is an integer number (4166826768).

Almost surely, 2^16656510641 is an apocalyptic number.

It is an amenable number.

16656510641 is a deficient number, since it is larger than the sum of its proper divisors (10796431).

16656510641 is a wasteful number, since it uses less digits than its factorization.

16656510641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10796430.

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 16656510641 in words is "sixteen billion, six hundred fifty-six million, five hundred ten thousand, six hundred forty-one".