61152521537 has 2 divisors, whose sum is σ = 61152521538. Its totient is φ = 61152521536.

The previous prime is 61152521501. The next prime is 61152521557. The reversal of 61152521537 is 73512525116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60612470416 + 540051121 = 246196^2 + 23239^2 .

It is a cyclic number.

It is not a de Polignac number, because 61152521537 - 2⁸ = 61152521281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61152521537.

It is not a weakly prime, because it can be changed into another prime (61152521557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30576260768 + 30576260769.

It is an arithmetic number, because the mean of its divisors is an integer number (30576260769).

Almost surely, 2^61152521537 is an apocalyptic number.

It is an amenable number.

61152521537 is a deficient number, since it is larger than the sum of its proper divisors (1).

61152521537 is an equidigital number, since it uses as much as digits as its factorization.

61152521537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63000, while the sum is 38.

The spelling of 61152521537 in words is "sixty-one billion, one hundred fifty-two million, five hundred twenty-one thousand, five hundred thirty-seven".