161613776064 has 112 divisors (see below), whose sum is σ = 460673256960. Its totient is φ = 49708139520.

The previous prime is 161613776017. The next prime is 161613776089. The reversal of 161613776064 is 460677316161.

It is a super-2 number, since 2×161613776064² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 7324729 + ... + 7346759.

It is an arithmetic number, because the mean of its divisors is an integer number (4113154080).

Almost surely, 2^161613776064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161613776064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230336628480).

161613776064 is an abundant number, since it is smaller than the sum of its proper divisors (299059480896).

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

161613776064 is a wasteful number, since it uses less digits than its factorization.

161613776064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24998 (or 24988 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 48.

The spelling of 161613776064 in words is "one hundred sixty-one billion, six hundred thirteen million, seven hundred seventy-six thousand, sixty-four".