61865296779 has 32 divisors (see below), whose sum is σ = 96926860800. Its totient is φ = 34603176960.

The previous prime is 61865296777. The next prime is 61865296781. The reversal of 61865296779 is 97769256816.

It is an interprime number because it is at equal distance from previous prime (61865296777) and next prime (61865296781).

It is not a de Polignac number, because 61865296779 - 2¹ = 61865296777 is a prime.

It is a super-3 number, since 3×61865296779³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (61865296777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2858802 + ... + 2880360.

It is an arithmetic number, because the mean of its divisors is an integer number (3028964400).

Almost surely, 2^61865296779 is an apocalyptic number.

61865296779 is a deficient number, since it is larger than the sum of its proper divisors (35061564021).

61865296779 is a wasteful number, since it uses less digits than its factorization.

61865296779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28275.

The product of its digits is 68584320, while the sum is 66.

The spelling of 61865296779 in words is "sixty-one billion, eight hundred sixty-five million, two hundred ninety-six thousand, seven hundred seventy-nine".