642782953808 has 40 divisors (see below), whose sum is σ = 1248390708000. Its totient is φ = 320618136960.

The previous prime is 642782953807. The next prime is 642782953811. The reversal of 642782953808 is 808359287246.

It is a super-2 number, since 2×642782953808² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642782953807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21597818 + ... + 21627558.

It is an arithmetic number, because the mean of its divisors is an integer number (31209767700).

Almost surely, 2^642782953808 is an apocalyptic number.

It is an amenable number.

642782953808 is a deficient number, since it is larger than the sum of its proper divisors (605607754192).

642782953808 is a wasteful number, since it uses less digits than its factorization.

642782953808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32955 (or 32949 counting only the distinct ones).

The product of its (nonzero) digits is 46448640, while the sum is 62.

The spelling of 642782953808 in words is "six hundred forty-two billion, seven hundred eighty-two million, nine hundred fifty-three thousand, eight hundred eight".