608915121292721 has 2 divisors, whose sum is σ = 608915121292722. Its totient is φ = 608915121292720.

The previous prime is 608915121292679. The next prime is 608915121292741. The reversal of 608915121292721 is 127292121519806.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 421454663068321 + 187460458224400 = 20529361^2 + 13691620^2 .

It is a cyclic number.

It is not a de Polignac number, because 608915121292721 - 2⁴⁶ = 538546377115057 is a prime.

It is not a weakly prime, because it can be changed into another prime (608915121292741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304457560646360 + 304457560646361.

It is an arithmetic number, because the mean of its divisors is an integer number (304457560646361).

Almost surely, 2^{608915121292721} is an apocalyptic number.

It is an amenable number.

608915121292721 is a deficient number, since it is larger than the sum of its proper divisors (1).

608915121292721 is an equidigital number, since it uses as much as digits as its factorization.

608915121292721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 56.

The spelling of 608915121292721 in words is "six hundred eight trillion, nine hundred fifteen billion, one hundred twenty-one million, two hundred ninety-two thousand, seven hundred twenty-one".