161551078 has 8 divisors (see below), whose sum is σ = 260967168. Its totient is φ = 74562024.

The previous prime is 161551073. The next prime is 161551087. The reversal of 161551078 is 870155161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161551073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3106726 + ... + 3106777.

It is an arithmetic number, because the mean of its divisors is an integer number (32620896).

Almost surely, 2^161551078 is an apocalyptic number.

161551078 is a deficient number, since it is larger than the sum of its proper divisors (99416090).

161551078 is a wasteful number, since it uses less digits than its factorization.

161551078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6213518.

The product of its (nonzero) digits is 8400, while the sum is 34.

The square root of 161551078 is about 12710.2745052969. The cubic root of 161551078 is about 544.6321654525.

The spelling of 161551078 in words is "one hundred sixty-one million, five hundred fifty-one thousand, seventy-eight".