621883138753 has 4 divisors (see below), whose sum is σ = 637051020228. Its totient is φ = 606715257280.

The previous prime is 621883138711. The next prime is 621883138783. The reversal of 621883138753 is 357831388126.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7960743729 + 613922395024 = 89223^2 + 783532^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621883138753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621883138694 and 621883138703.

It is not an unprimeable number, because it can be changed into a prime (621883138703) 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, 7583940676 + ... + 7583940757.

It is an arithmetic number, because the mean of its divisors is an integer number (159262755057).

Almost surely, 2^621883138753 is an apocalyptic number.

It is an amenable number.

621883138753 is a deficient number, since it is larger than the sum of its proper divisors (15167881475).

621883138753 is a wasteful number, since it uses less digits than its factorization.

621883138753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15167881474.

The product of its digits is 5806080, while the sum is 55.

The spelling of 621883138753 in words is "six hundred twenty-one billion, eight hundred eighty-three million, one hundred thirty-eight thousand, seven hundred fifty-three".