621621646747 has 4 divisors (see below), whose sum is σ = 621679954480. Its totient is φ = 621563339016.

The previous prime is 621621646741. The next prime is 621621646769. The reversal of 621621646747 is 747646126126.

621621646747 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 621621646747 - 2⁷ = 621621646619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621621646694 and 621621646703.

It is not an unprimeable number, because it can be changed into a prime (621621646741) 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, 29137872 + ... + 29159197.

It is an arithmetic number, because the mean of its divisors is an integer number (155419988620).

Almost surely, 2^621621646747 is an apocalyptic number.

621621646747 is a deficient number, since it is larger than the sum of its proper divisors (58307733).

621621646747 is a wasteful number, since it uses less digits than its factorization.

621621646747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58307732.

The product of its digits is 4064256, while the sum is 52.

The spelling of 621621646747 in words is "six hundred twenty-one billion, six hundred twenty-one million, six hundred forty-six thousand, seven hundred forty-seven".