16731306657 has 24 divisors (see below), whose sum is σ = 26034962408. Its totient is φ = 10292832000.

The previous prime is 16731306629. The next prime is 16731306731. The reversal of 16731306657 is 75660313761.

It can be written as a sum of positive squares in 4 ways, for example, as 1102306401 + 15629000256 = 33201^2 + 125016^2 .

It is not a de Polignac number, because 16731306657 - 2¹¹ = 16731304609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16731306157) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 364557 + ... + 407877.

Almost surely, 2^16731306657 is an apocalyptic number.

It is an amenable number.

16731306657 is a deficient number, since it is larger than the sum of its proper divisors (9303655751).

16731306657 is a wasteful number, since it uses less digits than its factorization.

16731306657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46641 (or 46638 counting only the distinct ones).

The product of its (nonzero) digits is 476280, while the sum is 45.

The spelling of 16731306657 in words is "sixteen billion, seven hundred thirty-one million, three hundred six thousand, six hundred fifty-seven".