61627720571690 has 128 divisors (see below), whose sum is σ = 141397844410368. Its totient is φ = 18820313084160.

The previous prime is 61627720571687. The next prime is 61627720571743. The reversal of 61627720571690 is 9617502772616.

It is a super-2 number, since 2×61627720571690² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

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, 7110584 + ... + 13183923.

It is an arithmetic number, because the mean of its divisors is an integer number (1104670659456).

Almost surely, 2^{61627720571690} is an apocalyptic number.

61627720571690 is an abundant number, since it is smaller than the sum of its proper divisors (79770123838678).

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

61627720571690 is a wasteful number, since it uses less digits than its factorization.

61627720571690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20294652.

The product of its (nonzero) digits is 13335840, while the sum is 59.

The spelling of 61627720571690 in words is "sixty-one trillion, six hundred twenty-seven billion, seven hundred twenty million, five hundred seventy-one thousand, six hundred ninety".