61212004657 has 2 divisors, whose sum is σ = 61212004658. Its totient is φ = 61212004656.

The previous prime is 61212004631. The next prime is 61212004723. The reversal of 61212004657 is 75640021216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57618721521 + 3593283136 = 240039^2 + 59944^2 .

It is a cyclic number.

It is not a de Polignac number, because 61212004657 - 2²³ = 61203616049 is a prime.

It is not a weakly prime, because it can be changed into another prime (61212004157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30606002328 + 30606002329.

It is an arithmetic number, because the mean of its divisors is an integer number (30606002329).

Almost surely, 2^61212004657 is an apocalyptic number.

It is an amenable number.

61212004657 is a deficient number, since it is larger than the sum of its proper divisors (1).

61212004657 is an equidigital number, since it uses as much as digits as its factorization.

61212004657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 61212004657 in words is "sixty-one billion, two hundred twelve million, four thousand, six hundred fifty-seven".