16117565651 has 16 divisors (see below), whose sum is σ = 18513100800. Its totient is φ = 13877488800.

The previous prime is 16117565647. The next prime is 16117565677. The reversal of 16117565651 is 15656571161.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16117565651 - 2² = 16117565647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16117565641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1041710 + ... + 1057068.

It is an arithmetic number, because the mean of its divisors is an integer number (1157068800).

Almost surely, 2^16117565651 is an apocalyptic number.

16117565651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16117565651 is a deficient number, since it is larger than the sum of its proper divisors (2395535149).

16117565651 is a wasteful number, since it uses less digits than its factorization.

16117565651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20410.

The product of its digits is 189000, while the sum is 44.

The spelling of 16117565651 in words is "sixteen billion, one hundred seventeen million, five hundred sixty-five thousand, six hundred fifty-one".