61945275499 has 16 divisors (see below), whose sum is σ = 64065795264. Its totient is φ = 59861692800.

The previous prime is 61945275493. The next prime is 61945275547. The reversal of 61945275499 is 99457254916.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61945275499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61945275493) 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, 4105429 + ... + 4120489.

It is an arithmetic number, because the mean of its divisors is an integer number (4004112204).

Almost surely, 2^61945275499 is an apocalyptic number.

61945275499 is a deficient number, since it is larger than the sum of its proper divisors (2120519765).

61945275499 is a wasteful number, since it uses less digits than its factorization.

61945275499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16278.

The product of its digits is 24494400, while the sum is 61.

It can be divided in two parts, 6194527 and 5499, that added together give a palindrome (6200026).

The spelling of 61945275499 in words is "sixty-one billion, nine hundred forty-five million, two hundred seventy-five thousand, four hundred ninety-nine".