642312604991 has 2 divisors, whose sum is σ = 642312604992. Its totient is φ = 642312604990.

The previous prime is 642312604957. The next prime is 642312605029. The reversal of 642312604991 is 199406213246.

642312604991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642312604991 - 2²² = 642308410687 is a prime.

It is a super-2 number, since 2×642312604991² (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 (642312604091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321156302495 + 321156302496.

It is an arithmetic number, because the mean of its divisors is an integer number (321156302496).

Almost surely, 2^642312604991 is an apocalyptic number.

642312604991 is a deficient number, since it is larger than the sum of its proper divisors (1).

642312604991 is an equidigital number, since it uses as much as digits as its factorization.

642312604991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 642312604991 in words is "six hundred forty-two billion, three hundred twelve million, six hundred four thousand, nine hundred ninety-one".