621249660730 has 16 divisors (see below), whose sum is σ = 1184028765480. Its totient is φ = 233882225152.

The previous prime is 621249660719. The next prime is 621249660769. The reversal of 621249660730 is 37066942126.

It can be written as a sum of positive squares in 4 ways, for example, as 473937241761 + 147312418969 = 688431^2 + 383813^2 .

It is a super-2 number, since 2×621249660730² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1827204715 + ... + 1827205054.

Almost surely, 2^621249660730 is an apocalyptic number.

621249660730 is a deficient number, since it is larger than the sum of its proper divisors (562779104750).

621249660730 is a wasteful number, since it uses less digits than its factorization.

621249660730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3654409793.

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 621249660730 in words is "six hundred twenty-one billion, two hundred forty-nine million, six hundred sixty thousand, seven hundred thirty".