16351631640261 has 12 divisors (see below), whose sum is σ = 23730961983040. Its totient is φ = 10849423835880.

The previous prime is 16351631640251. The next prime is 16351631640287. The reversal of 16351631640261 is 16204613615361.

16351631640261 is a `hidden beast` number, since 1 + 6 + 3 + 5 + 1 + 631 + 6 + 4 + 0 + 2 + 6 + 1 = 666.

16351631640261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-16351631640261 is a prime.

It is a super-2 number, since 2×16351631640261² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16351631640221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4305325021 + ... + 4305328818.

Almost surely, 2^{16351631640261} is an apocalyptic number.

It is an amenable number.

16351631640261 is a deficient number, since it is larger than the sum of its proper divisors (7379330342779).

16351631640261 is a wasteful number, since it uses less digits than its factorization.

16351631640261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8610654056 (or 8610654053 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 16351631640261 in words is "sixteen trillion, three hundred fifty-one billion, six hundred thirty-one million, six hundred forty thousand, two hundred sixty-one".