61224478537 has 2 divisors, whose sum is σ = 61224478538. Its totient is φ = 61224478536.

The previous prime is 61224478519. The next prime is 61224478613. The reversal of 61224478537 is 73587442216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51633018441 + 9591460096 = 227229^2 + 97936^2 .

It is a cyclic number.

It is not a de Polignac number, because 61224478537 - 2²⁷ = 61090260809 is a prime.

It is not a weakly prime, because it can be changed into another prime (61224428537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30612239268 + 30612239269.

It is an arithmetic number, because the mean of its divisors is an integer number (30612239269).

Almost surely, 2^61224478537 is an apocalyptic number.

It is an amenable number.

61224478537 is a deficient number, since it is larger than the sum of its proper divisors (1).

61224478537 is an equidigital number, since it uses as much as digits as its factorization.

61224478537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 49.

The spelling of 61224478537 in words is "sixty-one billion, two hundred twenty-four million, four hundred seventy-eight thousand, five hundred thirty-seven".