621542972090039 has 4 divisors (see below), whose sum is σ = 621543981339456. Its totient is φ = 621541962840624.

The previous prime is 621542972089973. The next prime is 621542972090081. The reversal of 621542972090039 is 930090279245126.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621542972090039 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 621542972090039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621542972090539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503700374 + ... + 504932819.

It is an arithmetic number, because the mean of its divisors is an integer number (155385995334864).

Almost surely, 2^{621542972090039} is an apocalyptic number.

621542972090039 is a deficient number, since it is larger than the sum of its proper divisors (1009249417).

621542972090039 is a wasteful number, since it uses less digits than its factorization.

621542972090039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009249416.

The product of its (nonzero) digits is 14696640, while the sum is 59.

The spelling of 621542972090039 in words is "six hundred twenty-one trillion, five hundred forty-two billion, nine hundred seventy-two million, ninety thousand, thirty-nine".