61264900861 has 2 divisors, whose sum is σ = 61264900862. Its totient is φ = 61264900860.

The previous prime is 61264900799. The next prime is 61264900903. The reversal of 61264900861 is 16800946216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42160408900 + 19104491961 = 205330^2 + 138219^2 .

It is a cyclic number.

It is not a de Polignac number, because 61264900861 - 2⁷ = 61264900733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61264907861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30632450430 + 30632450431.

It is an arithmetic number, because the mean of its divisors is an integer number (30632450431).

Almost surely, 2^61264900861 is an apocalyptic number.

It is an amenable number.

61264900861 is a deficient number, since it is larger than the sum of its proper divisors (1).

61264900861 is an equidigital number, since it uses as much as digits as its factorization.

61264900861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 61264900861 in words is "sixty-one billion, two hundred sixty-four million, nine hundred thousand, eight hundred sixty-one".