621323520642 has 64 divisors (see below), whose sum is σ = 1527453573120. Its totient is φ = 185628013200.

The previous prime is 621323520607. The next prime is 621323520667. The reversal of 621323520642 is 246025323126.

621323520642 is a `hidden beast` number, since 6 + 2 + 1 + 3 + 2 + 3 + 5 + 2 + 0 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 621323520597 and 621323520606.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7324018 + ... + 7408365.

It is an arithmetic number, because the mean of its divisors is an integer number (23866462080).

Almost surely, 2^621323520642 is an apocalyptic number.

621323520642 is an abundant number, since it is smaller than the sum of its proper divisors (906130052478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621323520642 is a wasteful number, since it uses less digits than its factorization.

621323520642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14732476 (or 14732470 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 621323520642 its reverse (246025323126), we get a palindrome (867348843768).

The spelling of 621323520642 in words is "six hundred twenty-one billion, three hundred twenty-three million, five hundred twenty thousand, six hundred forty-two".