621445742579 has 2 divisors, whose sum is σ = 621445742580. Its totient is φ = 621445742578.

The previous prime is 621445742551. The next prime is 621445742591. The reversal of 621445742579 is 975247544126.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621445742579 is a prime.

It is not a weakly prime, because it can be changed into another prime (621445742479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310722871289 + 310722871290.

It is an arithmetic number, because the mean of its divisors is an integer number (310722871290).

Almost surely, 2^621445742579 is an apocalyptic number.

621445742579 is a deficient number, since it is larger than the sum of its proper divisors (1).

621445742579 is an equidigital number, since it uses as much as digits as its factorization.

621445742579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16934400, while the sum is 56.

The spelling of 621445742579 in words is "six hundred twenty-one billion, four hundred forty-five million, seven hundred forty-two thousand, five hundred seventy-nine".