642247515622 has 4 divisors (see below), whose sum is σ = 963371273436. Its totient is φ = 321123757810.

The previous prime is 642247515577. The next prime is 642247515643. The reversal of 642247515622 is 226515742246.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×642247515622² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160561878904 + ... + 160561878907.

It is an arithmetic number, because the mean of its divisors is an integer number (240842818359).

Almost surely, 2^642247515622 is an apocalyptic number.

642247515622 is a deficient number, since it is larger than the sum of its proper divisors (321123757814).

642247515622 is a wasteful number, since it uses less digits than its factorization.

642247515622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321123757813.

The product of its digits is 1612800, while the sum is 46.

The spelling of 642247515622 in words is "six hundred forty-two billion, two hundred forty-seven million, five hundred fifteen thousand, six hundred twenty-two".