655374354521 has 2 divisors, whose sum is σ = 655374354522. Its totient is φ = 655374354520.

The previous prime is 655374354457. The next prime is 655374354553. The reversal of 655374354521 is 125453473556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 638618346496 + 16756008025 = 799136^2 + 129445^2 .

It is a cyclic number.

It is not a de Polignac number, because 655374354521 - 2⁶ = 655374354457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 655374354521.

It is not a weakly prime, because it can be changed into another prime (655374654521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327687177260 + 327687177261.

It is an arithmetic number, because the mean of its divisors is an integer number (327687177261).

Almost surely, 2^655374354521 is an apocalyptic number.

It is an amenable number.

655374354521 is a deficient number, since it is larger than the sum of its proper divisors (1).

655374354521 is an equidigital number, since it uses as much as digits as its factorization.

655374354521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560000, while the sum is 50.

The spelling of 655374354521 in words is "six hundred fifty-five billion, three hundred seventy-four million, three hundred fifty-four thousand, five hundred twenty-one".