16651057011521 has 16 divisors (see below), whose sum is σ = 17567721345600. Its totient is φ = 15738462969408.

The previous prime is 16651057011499. The next prime is 16651057011529. The reversal of 16651057011521 is 12511075015661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16651057011521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16651057011529) 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, 14074370 + ... + 15211508.

It is an arithmetic number, because the mean of its divisors is an integer number (1097982584100).

Almost surely, 2^{16651057011521} is an apocalyptic number.

It is an amenable number.

16651057011521 is a deficient number, since it is larger than the sum of its proper divisors (916664334079).

16651057011521 is a wasteful number, since it uses less digits than its factorization.

16651057011521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138928.

The product of its (nonzero) digits is 63000, while the sum is 41.

The spelling of 16651057011521 in words is "sixteen trillion, six hundred fifty-one billion, fifty-seven million, eleven thousand, five hundred twenty-one".