161165555661510 has 128 divisors (see below), whose sum is σ = 435750718435200. Its totient is φ = 42383044730880.

The previous prime is 161165555661437. The next prime is 161165555661511. The reversal of 161165555661510 is 15166555561161.

161165555661510 is a `hidden beast` number, since 1 + 6 + 1 + 1 + 6 + 5 + 5 + 5 + 5 + 6 + 615 + 10 = 666.

161165555661510 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161165555661511) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3590265 + ... + 18309044.

It is an arithmetic number, because the mean of its divisors is an integer number (3404302487775).

Almost surely, 2^{161165555661510} is an apocalyptic number.

161165555661510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161165555661510 is an abundant number, since it is smaller than the sum of its proper divisors (274585162773690).

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

161165555661510 is a wasteful number, since it uses less digits than its factorization.

161165555661510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21899703 (or 21899697 counting only the distinct ones).

The product of its (nonzero) digits is 4050000, while the sum is 54.

The spelling of 161165555661510 in words is "one hundred sixty-one trillion, one hundred sixty-five billion, five hundred fifty-five million, six hundred sixty-one thousand, five hundred ten".