642325105381 has 2 divisors, whose sum is σ = 642325105382. Its totient is φ = 642325105380.

The previous prime is 642325105379. The next prime is 642325105417. The reversal of 642325105381 is 183501523246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 571776433281 + 70548672100 = 756159^2 + 265610^2 .

It is a cyclic number.

It is not a de Polignac number, because 642325105381 - 2¹ = 642325105379 is a prime.

It is a super-2 number, since 2×642325105381² (a number of 24 digits) contains 22 as substring.

Together with 642325105379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642325105351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321162552690 + 321162552691.

It is an arithmetic number, because the mean of its divisors is an integer number (321162552691).

Almost surely, 2^642325105381 is an apocalyptic number.

It is an amenable number.

642325105381 is a deficient number, since it is larger than the sum of its proper divisors (1).

642325105381 is an equidigital number, since it uses as much as digits as its factorization.

642325105381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 642325105381 in words is "six hundred forty-two billion, three hundred twenty-five million, one hundred five thousand, three hundred eighty-one".