61700172912 has 180 divisors, whose sum is σ = 209634841936. Its totient is φ = 16591564800.

The previous prime is 61700172907. The next prime is 61700172931. The reversal of 61700172912 is 21927100716.

It is a happy number.

61700172912 is a `hidden beast` number, since 617 + 0 + 0 + 1 + 7 + 29 + 12 = 666.

It is a super-2 number, since 2×61700172912² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 185412 + ... + 397212.

Almost surely, 2^61700172912 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 61700172912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104817420968).

61700172912 is an abundant number, since it is smaller than the sum of its proper divisors (147934669024).

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

61700172912 is a wasteful number, since it uses less digits than its factorization.

61700172912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211856 (or 211830 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The spelling of 61700172912 in words is "sixty-one billion, seven hundred million, one hundred seventy-two thousand, nine hundred twelve".