161387639910 has 48 divisors (see below), whose sum is σ = 479551846176. Its totient is φ = 36888603264.

The previous prime is 161387639891. The next prime is 161387639969. The reversal of 161387639910 is 19936783161.

It is a happy number.

161387639910 is a `hidden beast` number, since 1 + 613 + 8 + 7 + 6 + 3 + 9 + 9 + 10 = 666.

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, 128084799 + ... + 128086058.

It is an arithmetic number, because the mean of its divisors is an integer number (9990663462).

Almost surely, 2^161387639910 is an apocalyptic number.

161387639910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161387639910 is an abundant number, since it is smaller than the sum of its proper divisors (318164206266).

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

161387639910 is a wasteful number, since it uses less digits than its factorization.

161387639910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256170877 (or 256170874 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The spelling of 161387639910 in words is "one hundred sixty-one billion, three hundred eighty-seven million, six hundred thirty-nine thousand, nine hundred ten".