621961375128 has 32 divisors (see below), whose sum is σ = 1576803490560. Its totient is φ = 204400451360.

The previous prime is 621961375103. The next prime is 621961375129. The reversal of 621961375128 is 821573169126.

621961375128 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 a super-2 number, since 2×621961375128² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621961375129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182498700 + ... + 182502107.

It is an arithmetic number, because the mean of its divisors is an integer number (49275109080).

Almost surely, 2^621961375128 is an apocalyptic number.

It is an amenable number.

621961375128 is an abundant number, since it is smaller than the sum of its proper divisors (954842115432).

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

621961375128 is a wasteful number, since it uses less digits than its factorization.

621961375128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365000887 (or 365000883 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The spelling of 621961375128 in words is "six hundred twenty-one billion, nine hundred sixty-one million, three hundred seventy-five thousand, one hundred twenty-eight".