642436070665 has 32 divisors (see below), whose sum is σ = 823180538880. Its totient is φ = 480445344000.

The previous prime is 642436070597. The next prime is 642436070671. The reversal of 642436070665 is 566070634246.

It is a happy number.

It is not a de Polignac number, because 642436070665 - 2⁷ = 642436070537 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, 394215 + ... + 1200115.

It is an arithmetic number, because the mean of its divisors is an integer number (25724391840).

Almost surely, 2^642436070665 is an apocalyptic number.

It is an amenable number.

642436070665 is a deficient number, since it is larger than the sum of its proper divisors (180744468215).

642436070665 is a wasteful number, since it uses less digits than its factorization.

642436070665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806113.

The product of its (nonzero) digits is 4354560, while the sum is 49.

The spelling of 642436070665 in words is "six hundred forty-two billion, four hundred thirty-six million, seventy thousand, six hundred sixty-five".