161220910090136 has 64 divisors (see below), whose sum is σ = 334355041567680. Its totient is φ = 72395465126400.

The previous prime is 161220910090063. The next prime is 161220910090139. The reversal of 161220910090136 is 631090019022161.

It is a junction number, because it is equal to n+sod(n) for n = 161220910090093 and 161220910090102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161220910090139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89758061 + ... + 91536611.

It is an arithmetic number, because the mean of its divisors is an integer number (5224297524495).

Almost surely, 2^{161220910090136} is an apocalyptic number.

It is an amenable number.

161220910090136 is an abundant number, since it is smaller than the sum of its proper divisors (173134131477544).

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

161220910090136 is a wasteful number, since it uses less digits than its factorization.

161220910090136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802164 (or 1802160 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 161220910090136 in words is "one hundred sixty-one trillion, two hundred twenty billion, nine hundred ten million, ninety thousand, one hundred thirty-six".