61207912457 has 2 divisors, whose sum is σ = 61207912458. Its totient is φ = 61207912456.

The previous prime is 61207912421. The next prime is 61207912471. The reversal of 61207912457 is 75421970216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39416543296 + 21791369161 = 198536^2 + 147619^2 .

It is a cyclic number.

It is not a de Polignac number, because 61207912457 - 2²⁰ = 61206863881 is a prime.

It is not a weakly prime, because it can be changed into another prime (61207912477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30603956228 + 30603956229.

It is an arithmetic number, because the mean of its divisors is an integer number (30603956229).

Almost surely, 2^61207912457 is an apocalyptic number.

It is an amenable number.

61207912457 is a deficient number, since it is larger than the sum of its proper divisors (1).

61207912457 is an equidigital number, since it uses as much as digits as its factorization.

61207912457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 61207912457 in words is "sixty-one billion, two hundred seven million, nine hundred twelve thousand, four hundred fifty-seven".