642370155643626 has 16 divisors (see below), whose sum is σ = 1329041701332000. Its totient is φ = 206739820207088.

The previous prime is 642370155643621. The next prime is 642370155643639. The reversal of 642370155643626 is 626346551073246.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 642370155643626.

It is not an unprimeable number, because it can be changed into a prime (642370155643621) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1845891251676 + ... + 1845891252023.

It is an arithmetic number, because the mean of its divisors is an integer number (83065106333250).

Almost surely, 2^{642370155643626} is an apocalyptic number.

642370155643626 is an abundant number, since it is smaller than the sum of its proper divisors (686671545688374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642370155643626 is a wasteful number, since it uses less digits than its factorization.

642370155643626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691782503733.

The product of its (nonzero) digits is 130636800, while the sum is 60.

The spelling of 642370155643626 in words is "six hundred forty-two trillion, three hundred seventy billion, one hundred fifty-five million, six hundred forty-three thousand, six hundred twenty-six".