161515165650 has 24 divisors (see below), whose sum is σ = 400557611184. Its totient is φ = 43070710800.

The previous prime is 161515165631. The next prime is 161515165657. The reversal of 161515165650 is 56561515161.

It is not an unprimeable number, because it can be changed into a prime (161515165657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 538383736 + ... + 538384035.

It is an arithmetic number, because the mean of its divisors is an integer number (16689900466).

Almost surely, 2^161515165650 is an apocalyptic number.

161515165650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161515165650 is an abundant number, since it is smaller than the sum of its proper divisors (239042445534).

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

161515165650 is a wasteful number, since it uses less digits than its factorization.

161515165650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076767786 (or 1076767781 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 42.

The spelling of 161515165650 in words is "one hundred sixty-one billion, five hundred fifteen million, one hundred sixty-five thousand, six hundred fifty".