61924640737 has 2 divisors, whose sum is σ = 61924640738. Its totient is φ = 61924640736.

The previous prime is 61924640719. The next prime is 61924640753. The reversal of 61924640737 is 73704642916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36770363536 + 25154277201 = 191756^2 + 158601^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61924640737 is a prime.

It is a super-2 number, since 2×61924640737² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61924640707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30962320368 + 30962320369.

It is an arithmetic number, because the mean of its divisors is an integer number (30962320369).

Almost surely, 2^61924640737 is an apocalyptic number.

It is an amenable number.

61924640737 is a deficient number, since it is larger than the sum of its proper divisors (1).

61924640737 is an equidigital number, since it uses as much as digits as its factorization.

61924640737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 49.

The spelling of 61924640737 in words is "sixty-one billion, nine hundred twenty-four million, six hundred forty thousand, seven hundred thirty-seven".