642662405131 has 2 divisors, whose sum is σ = 642662405132. Its totient is φ = 642662405130.

The previous prime is 642662405117. The next prime is 642662405171. The reversal of 642662405131 is 131504266246.

It is an a-pointer prime, because the next prime (642662405171) can be obtained adding 642662405131 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642662405131 - 2²³ = 642654016523 is a prime.

It is a super-2 number, since 2×642662405131² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (642662405111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321331202565 + 321331202566.

It is an arithmetic number, because the mean of its divisors is an integer number (321331202566).

Almost surely, 2^642662405131 is an apocalyptic number.

642662405131 is a deficient number, since it is larger than the sum of its proper divisors (1).

642662405131 is an equidigital number, since it uses as much as digits as its factorization.

642662405131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 642662405131 in words is "six hundred forty-two billion, six hundred sixty-two million, four hundred five thousand, one hundred thirty-one".