621090550079 has 4 divisors (see below), whose sum is σ = 621477042384. Its totient is φ = 620704057776.

The previous prime is 621090550049. The next prime is 621090550141. The reversal of 621090550079 is 970055090126.

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-621090550079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621090550009) 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, 193243742 + ... + 193246955.

It is an arithmetic number, because the mean of its divisors is an integer number (155369260596).

Almost surely, 2^621090550079 is an apocalyptic number.

621090550079 is a deficient number, since it is larger than the sum of its proper divisors (386492305).

621090550079 is a wasteful number, since it uses less digits than its factorization.

621090550079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386492304.

The product of its (nonzero) digits is 170100, while the sum is 44.

The spelling of 621090550079 in words is "six hundred twenty-one billion, ninety million, five hundred fifty thousand, seventy-nine".