161616531510 has 48 divisors (see below), whose sum is σ = 480231981216. Its totient is φ = 36940921344.

The previous prime is 161616531457. The next prime is 161616531521. The reversal of 161616531510 is 15135616161.

161616531510 is a `hidden beast` number, since 1 + 6 + 1 + 616 + 5 + 31 + 5 + 1 + 0 = 666.

It is a super-2 number, since 2×161616531510² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128266459 + ... + 128267718.

It is an arithmetic number, because the mean of its divisors is an integer number (10004832942).

Almost surely, 2^161616531510 is an apocalyptic number.

161616531510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161616531510 is an abundant number, since it is smaller than the sum of its proper divisors (318615449706).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161616531510 is a wasteful number, since it uses less digits than its factorization.

161616531510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256534197 (or 256534194 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The spelling of 161616531510 in words is "one hundred sixty-one billion, six hundred sixteen million, five hundred thirty-one thousand, five hundred ten".