161887400005 has 16 divisors (see below), whose sum is σ = 197287776000. Its totient is φ = 127504054080.

The previous prime is 161887399967. The next prime is 161887400083. The reversal of 161887400005 is 500004788161.

It is a de Polignac number, because none of the positive numbers 2^k-161887400005 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 449311 + ... + 725020.

It is an arithmetic number, because the mean of its divisors is an integer number (12330486000).

Almost surely, 2^161887400005 is an apocalyptic number.

It is an amenable number.

161887400005 is a deficient number, since it is larger than the sum of its proper divisors (35400375995).

161887400005 is a wasteful number, since it uses less digits than its factorization.

161887400005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174764.

The product of its (nonzero) digits is 53760, while the sum is 40.

The spelling of 161887400005 in words is "one hundred sixty-one billion, eight hundred eighty-seven million, four hundred thousand, five".