61777366465 has 16 divisors (see below), whose sum is σ = 77428931328. Its totient is φ = 47228550336.

The previous prime is 61777366451. The next prime is 61777366507. The reversal of 61777366465 is 56466377716.

It is not a de Polignac number, because 61777366465 - 2⁵ = 61777366433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130434 + ... + 374923.

It is an arithmetic number, because the mean of its divisors is an integer number (4839308208).

Almost surely, 2^61777366465 is an apocalyptic number.

It is an amenable number.

61777366465 is a deficient number, since it is larger than the sum of its proper divisors (15651564863).

61777366465 is a wasteful number, since it uses less digits than its factorization.

61777366465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506448.

The product of its digits is 26671680, while the sum is 58.

The spelling of 61777366465 in words is "sixty-one billion, seven hundred seventy-seven million, three hundred sixty-six thousand, four hundred sixty-five".