16161555604 has 6 divisors (see below), whose sum is σ = 28282722314. Its totient is φ = 8080777800.

The previous prime is 16161555601. The next prime is 16161555607. The reversal of 16161555604 is 40655516161.

It is an interprime number because it is at equal distance from previous prime (16161555601) and next prime (16161555607).

It can be written as a sum of positive squares in only one way, i.e., 13462960900 + 2698594704 = 116030^2 + 51948^2 .

It is a super-2 number, since 2×16161555604² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16161555601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2020194447 + ... + 2020194454.

Almost surely, 2^16161555604 is an apocalyptic number.

It is an amenable number.

16161555604 is a deficient number, since it is larger than the sum of its proper divisors (12121166710).

16161555604 is a wasteful number, since it uses less digits than its factorization.

16161555604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040388905 (or 4040388903 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 16161555604 in words is "sixteen billion, one hundred sixty-one million, five hundred fifty-five thousand, six hundred four".