161615788 has 6 divisors (see below), whose sum is σ = 282827636. Its totient is φ = 80807892.

The previous prime is 161615777. The next prime is 161615791. The reversal of 161615788 is 887516161.

It is a super-2 number, since 2×161615788² = 52239325861721888, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20201970 + ... + 20201977.

Almost surely, 2^161615788 is an apocalyptic number.

It is an amenable number.

161615788 is a deficient number, since it is larger than the sum of its proper divisors (121211848).

161615788 is a wasteful number, since it uses less digits than its factorization.

161615788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40403951 (or 40403949 counting only the distinct ones).

The product of its digits is 80640, while the sum is 43.

The square root of 161615788 is about 12712.8198288185. The cubic root of 161615788 is about 544.7048740210.

The spelling of 161615788 in words is "one hundred sixty-one million, six hundred fifteen thousand, seven hundred eighty-eight".