161215735700 has 36 divisors (see below), whose sum is σ = 361901537340. Its totient is φ = 62262627840.

The previous prime is 161215735687. The next prime is 161215735721. The reversal of 161215735700 is 7537512161.

161215735700 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 3164962564 + 158050773136 = 56258^2 + 397556^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27792917 + ... + 27798716.

Almost surely, 2^161215735700 is an apocalyptic number.

161215735700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161215735700 is an abundant number, since it is smaller than the sum of its proper divisors (200685801640).

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

161215735700 is a wasteful number, since it uses less digits than its factorization.

161215735700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55591676 (or 55591669 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 38.

The spelling of 161215735700 in words is "one hundred sixty-one billion, two hundred fifteen million, seven hundred thirty-five thousand, seven hundred".