642401895465 has 32 divisors (see below), whose sum is σ = 1245870345600. Its totient is φ = 311467584960.

The previous prime is 642401895437. The next prime is 642401895497. The reversal of 642401895465 is 564598104246.

It is a happy number.

642401895465 is a `hidden beast` number, since 6 + 42 + 40 + 18 + 9 + 546 + 5 = 666.

It is not a de Polignac number, because 642401895465 - 2⁷ = 642401895337 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216295450 + ... + 216298419.

It is an arithmetic number, because the mean of its divisors is an integer number (38933448300).

Almost surely, 2^642401895465 is an apocalyptic number.

It is an amenable number.

642401895465 is a deficient number, since it is larger than the sum of its proper divisors (603468450135).

642401895465 is a wasteful number, since it uses less digits than its factorization.

642401895465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432593894 (or 432593888 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 54.

The spelling of 642401895465 in words is "six hundred forty-two billion, four hundred one million, eight hundred ninety-five thousand, four hundred sixty-five".