61277777457 has 16 divisors (see below), whose sum is σ = 89193931008. Its totient is φ = 37192832640.

The previous prime is 61277777443. The next prime is 61277777459. The reversal of 61277777457 is 75477777216.

It is a happy number.

It is not a de Polignac number, because 61277777457 - 2⁴ = 61277777441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61277777457.

It is not an unprimeable number, because it can be changed into a prime (61277777459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10758969 + ... + 10764662.

It is an arithmetic number, because the mean of its divisors is an integer number (5574620688).

Almost surely, 2^61277777457 is an apocalyptic number.

It is an amenable number.

61277777457 is a deficient number, since it is larger than the sum of its proper divisors (27916153551).

61277777457 is a wasteful number, since it uses less digits than its factorization.

61277777457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21523720.

The product of its digits is 28235760, while the sum is 60.

The spelling of 61277777457 in words is "sixty-one billion, two hundred seventy-seven million, seven hundred seventy-seven thousand, four hundred fifty-seven".