621960517281 has 16 divisors (see below), whose sum is σ = 861138495360. Its totient is φ = 398820172800.

The previous prime is 621960517267. The next prime is 621960517289. The reversal of 621960517281 is 182715069126.

It is a happy number.

621960517281 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 621960517281 - 2⁷ = 621960517153 is a prime.

It is a super-2 number, since 2×621960517281² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 621960517281.

It is not an unprimeable number, because it can be changed into a prime (621960517289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13568320 + ... + 13614081.

It is an arithmetic number, because the mean of its divisors is an integer number (53821155960).

Almost surely, 2^621960517281 is an apocalyptic number.

It is an amenable number.

621960517281 is a deficient number, since it is larger than the sum of its proper divisors (239177978079).

621960517281 is a wasteful number, since it uses less digits than its factorization.

621960517281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27182696.

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 621960517281 in words is "six hundred twenty-one billion, nine hundred sixty million, five hundred seventeen thousand, two hundred eighty-one".