621146817793 has 4 divisors (see below), whose sum is σ = 627296786388. Its totient is φ = 614996849200.

The previous prime is 621146817773. The next prime is 621146817803. The reversal of 621146817793 is 397718641126.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 397718641126 = 2 ⋅198859320563.

It can be written as a sum of positive squares in 2 ways, for example, as 453295185984 + 167851631809 = 673272^2 + 409697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621146817793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621146817773) 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, 3074984146 + ... + 3074984347.

It is an arithmetic number, because the mean of its divisors is an integer number (156824196597).

Almost surely, 2^621146817793 is an apocalyptic number.

It is an amenable number.

621146817793 is a deficient number, since it is larger than the sum of its proper divisors (6149968595).

621146817793 is a wasteful number, since it uses less digits than its factorization.

621146817793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6149968594.

The product of its digits is 3048192, while the sum is 55.

The spelling of 621146817793 in words is "six hundred twenty-one billion, one hundred forty-six million, eight hundred seventeen thousand, seven hundred ninety-three".