61299529860661 has 2 divisors, whose sum is σ = 61299529860662. Its totient is φ = 61299529860660.

The previous prime is 61299529860629. The next prime is 61299529860697. The reversal of 61299529860661 is 16606892599216.

61299529860661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45255139113636 + 16044390747025 = 6727194^2 + 4005545^2 .

It is a cyclic number.

It is not a de Polignac number, because 61299529860661 - 2⁵ = 61299529860629 is a prime.

It is a super-2 number, since 2×61299529860661² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61299529860161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30649764930330 + 30649764930331.

It is an arithmetic number, because the mean of its divisors is an integer number (30649764930331).

Almost surely, 2^{61299529860661} is an apocalyptic number.

It is an amenable number.

61299529860661 is a deficient number, since it is larger than the sum of its proper divisors (1).

61299529860661 is an equidigital number, since it uses as much as digits as its factorization.

61299529860661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151165440, while the sum is 70.

The spelling of 61299529860661 in words is "sixty-one trillion, two hundred ninety-nine billion, five hundred twenty-nine million, eight hundred sixty thousand, six hundred sixty-one".