161651101049928 has 256 divisors, whose sum is σ = 517903157145600. Its totient is φ = 45761063685120.

The previous prime is 161651101049869. The next prime is 161651101049953. The reversal of 161651101049928 is 829940101156161.

161651101049928 is a `hidden beast` number, since 1 + 6 + 1 + 6 + 5 + 110 + 10 + 499 + 28 = 666.

It is a super-2 number, since 2×161651101049928² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 485577213 + ... + 485910003.

It is an arithmetic number, because the mean of its divisors is an integer number (2023059207600).

Almost surely, 2^{161651101049928} is an apocalyptic number.

161651101049928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161651101049928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258951578572800).

161651101049928 is an abundant number, since it is smaller than the sum of its proper divisors (356252056095672).

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

161651101049928 is a wasteful number, since it uses less digits than its factorization.

161651101049928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335769 (or 335759 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 54.

The spelling of 161651101049928 in words is "one hundred sixty-one trillion, six hundred fifty-one billion, one hundred one million, forty-nine thousand, nine hundred twenty-eight".