161972862064 has 20 divisors (see below), whose sum is σ = 337962606856. Its totient is φ = 74756705472.

The previous prime is 161972862053. The next prime is 161972862067. The reversal of 161972862064 is 460268279161.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161972862067) 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, 389357634 + ... + 389358049.

Almost surely, 2^161972862064 is an apocalyptic number.

It is an amenable number.

161972862064 is an abundant number, since it is smaller than the sum of its proper divisors (175989744792).

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

161972862064 is a wasteful number, since it uses less digits than its factorization.

161972862064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778715704 (or 778715698 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 161972862064 in words is "one hundred sixty-one billion, nine hundred seventy-two million, eight hundred sixty-two thousand, sixty-four".