161820770064 has 40 divisors (see below), whose sum is σ = 418734955200. Its totient is φ = 53850196608.

The previous prime is 161820770051. The next prime is 161820770077. The reversal of 161820770064 is 460077028161.

161820770064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161820770051) and next prime (161820770077).

It is a junction number, because it is equal to n+sod(n) for n = 161820769998 and 161820770025.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2785327 + ... + 2842830.

It is an arithmetic number, because the mean of its divisors is an integer number (10468373880).

Almost surely, 2^161820770064 is an apocalyptic number.

It is an amenable number.

161820770064 is an abundant number, since it is smaller than the sum of its proper divisors (256914185136).

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

161820770064 is a wasteful number, since it uses less digits than its factorization.

161820770064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5628767 (or 5628761 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 42.

The spelling of 161820770064 in words is "one hundred sixty-one billion, eight hundred twenty million, seven hundred seventy thousand, sixty-four".