61177256021 has 8 divisors (see below), whose sum is σ = 71343739200. Its totient is φ = 52437647724.

The previous prime is 61177255999. The next prime is 61177256029. The reversal of 61177256021 is 12065277116.

It is not a de Polignac number, because 61177256021 - 2¹⁴ = 61177239637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61177256029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89179331 + ... + 89180016.

It is an arithmetic number, because the mean of its divisors is an integer number (8917967400).

Almost surely, 2^61177256021 is an apocalyptic number.

It is an amenable number.

61177256021 is a deficient number, since it is larger than the sum of its proper divisors (10166483179).

61177256021 is an equidigital number, since it uses as much as digits as its factorization.

61177256021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178359368 (or 178359354 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 38.

The spelling of 61177256021 in words is "sixty-one billion, one hundred seventy-seven million, two hundred fifty-six thousand, twenty-one".