161357550 has 48 divisors (see below), whose sum is σ = 409942512. Its totient is φ = 41977600.

The previous prime is 161357549. The next prime is 161357563. The reversal of 161357550 is 55753161.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6969 + ... + 19268.

It is an arithmetic number, because the mean of its divisors is an integer number (8540469).

Almost surely, 2^161357550 is an apocalyptic number.

161357550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161357550 is an abundant number, since it is smaller than the sum of its proper divisors (248584962).

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

161357550 is a wasteful number, since it uses less digits than its factorization.

161357550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26293 (or 26288 counting only the distinct ones).

The product of its (nonzero) digits is 15750, while the sum is 33.

The square root of 161357550 is about 12702.6591704257. The cubic root of 161357550 is about 544.4146002275.

The spelling of 161357550 in words is "one hundred sixty-one million, three hundred fifty-seven thousand, five hundred fifty".