61275136613 has 2 divisors, whose sum is σ = 61275136614. Its totient is φ = 61275136612.

The previous prime is 61275136589. The next prime is 61275136669. The reversal of 61275136613 is 31663157216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53843489764 + 7431646849 = 232042^2 + 86207^2 .

It is a cyclic number.

It is not a de Polignac number, because 61275136613 - 2⁸ = 61275136357 is a prime.

It is a super-2 number, since 2×61275136613² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61275136673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30637568306 + 30637568307.

It is an arithmetic number, because the mean of its divisors is an integer number (30637568307).

Almost surely, 2^61275136613 is an apocalyptic number.

It is an amenable number.

61275136613 is a deficient number, since it is larger than the sum of its proper divisors (1).

61275136613 is an equidigital number, since it uses as much as digits as its factorization.

61275136613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 41.

The spelling of 61275136613 in words is "sixty-one billion, two hundred seventy-five million, one hundred thirty-six thousand, six hundred thirteen".