161125550 has 24 divisors (see below), whose sum is σ = 300464400. Its totient is φ = 64284480.

The previous prime is 161125469. The next prime is 161125577. The reversal of 161125550 is 55521161.

161125550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161125550² = 51922885725605000, which contains 22 as substring.

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, 16511 + ... + 24389.

It is an arithmetic number, because the mean of its divisors is an integer number (12519350).

Almost surely, 2^161125550 is an apocalyptic number.

161125550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161125550 is a deficient number, since it is larger than the sum of its proper divisors (139338850).

161125550 is a wasteful number, since it uses less digits than its factorization.

161125550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8300 (or 8295 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 26.

The square root of 161125550 is about 12693.5239393952. The cubic root of 161125550 is about 544.1535551776.

The spelling of 161125550 in words is "one hundred sixty-one million, one hundred twenty-five thousand, five hundred fifty".