16531870669 has 2 divisors, whose sum is σ = 16531870670. Its totient is φ = 16531870668.

The previous prime is 16531870591. The next prime is 16531870709. The reversal of 16531870669 is 96607813561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11666808169 + 4865062500 = 108013^2 + 69750^2 .

It is a cyclic number.

It is not a de Polignac number, because 16531870669 - 2²¹ = 16529773517 is a prime.

It is a super-2 number, since 2×16531870669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16531870169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8265935334 + 8265935335.

It is an arithmetic number, because the mean of its divisors is an integer number (8265935335).

Almost surely, 2^16531870669 is an apocalyptic number.

It is an amenable number.

16531870669 is a deficient number, since it is larger than the sum of its proper divisors (1).

16531870669 is an equidigital number, since it uses as much as digits as its factorization.

16531870669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 16531870669 in words is "sixteen billion, five hundred thirty-one million, eight hundred seventy thousand, six hundred sixty-nine".