621792460781 has 2 divisors, whose sum is σ = 621792460782. Its totient is φ = 621792460780.

The previous prime is 621792460771. The next prime is 621792460789. The reversal of 621792460781 is 187064297126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 595559475625 + 26232985156 = 771725^2 + 161966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621792460781 is a prime.

It is a super-2 number, since 2×621792460781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621792460789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310896230390 + 310896230391.

It is an arithmetic number, because the mean of its divisors is an integer number (310896230391).

Almost surely, 2^621792460781 is an apocalyptic number.

It is an amenable number.

621792460781 is a deficient number, since it is larger than the sum of its proper divisors (1).

621792460781 is an equidigital number, since it uses as much as digits as its factorization.

621792460781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 621792460781 in words is "six hundred twenty-one billion, seven hundred ninety-two million, four hundred sixty thousand, seven hundred eighty-one".