161564006385 has 24 divisors (see below), whose sum is σ = 280824373440. Its totient is φ = 85927440672.

The previous prime is 161564006381. The next prime is 161564006393. The reversal of 161564006385 is 583600465161.

161564006385 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 6 + 4 + 0 + 0 + 638 + 5 = 666.

It is not a de Polignac number, because 161564006385 - 2² = 161564006381 is a prime.

It is a super-2 number, since 2×161564006385² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 161564006385.

It is not an unprimeable number, because it can be changed into a prime (161564006381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4984279 + ... + 5016588.

It is an arithmetic number, because the mean of its divisors is an integer number (11701015560).

Almost surely, 2^161564006385 is an apocalyptic number.

161564006385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161564006385 is a deficient number, since it is larger than the sum of its proper divisors (119260367055).

161564006385 is a wasteful number, since it uses less digits than its factorization.

161564006385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10001237 (or 10001234 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 161564006385 in words is "one hundred sixty-one billion, five hundred sixty-four million, six thousand, three hundred eighty-five".