61775575717655 has 16 divisors (see below), whose sum is σ = 74268119722368. Its totient is φ = 49328859060000.

The previous prime is 61775575717613. The next prime is 61775575717673. The reversal of 61775575717655 is 55671757557716.

It is not a de Polignac number, because 61775575717655 - 2¹⁴ = 61775575701271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26907680 + ... + 29113130.

It is an arithmetic number, because the mean of its divisors is an integer number (4641757482648).

Almost surely, 2^{61775575717655} is an apocalyptic number.

61775575717655 is a deficient number, since it is larger than the sum of its proper divisors (12492544004713).

61775575717655 is a wasteful number, since it uses less digits than its factorization.

61775575717655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215838.

The product of its digits is 1890787500, while the sum is 74.

The spelling of 61775575717655 in words is "sixty-one trillion, seven hundred seventy-five billion, five hundred seventy-five million, seven hundred seventeen thousand, six hundred fifty-five".