621638239262 has 4 divisors (see below), whose sum is σ = 932457358896. Its totient is φ = 310819119630.

The previous prime is 621638239253. The next prime is 621638239307. The reversal of 621638239262 is 262932836126.

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

It is a self number, because there is not a number n which added to its sum of digits gives 621638239262.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155409559814 + ... + 155409559817.

It is an arithmetic number, because the mean of its divisors is an integer number (233114339724).

Almost surely, 2^621638239262 is an apocalyptic number.

621638239262 is a deficient number, since it is larger than the sum of its proper divisors (310819119634).

621638239262 is a wasteful number, since it uses less digits than its factorization.

621638239262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310819119633.

The product of its digits is 2239488, while the sum is 50.

The spelling of 621638239262 in words is "six hundred twenty-one billion, six hundred thirty-eight million, two hundred thirty-nine thousand, two hundred sixty-two".