621440090525 has 12 divisors (see below), whose sum is σ = 770919226464. Its totient is φ = 496936902000.

The previous prime is 621440090519. The next prime is 621440090543. The reversal of 621440090525 is 525090044126.

It is a happy number.

It is not a de Polignac number, because 621440090525 - 2¹⁴ = 621440074141 is a prime.

It is a super-2 number, since 2×621440090525² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5320331 + ... + 5435880.

It is an arithmetic number, because the mean of its divisors is an integer number (64243268872).

Almost surely, 2^621440090525 is an apocalyptic number.

It is an amenable number.

621440090525 is a deficient number, since it is larger than the sum of its proper divisors (149479135939).

621440090525 is a wasteful number, since it uses less digits than its factorization.

621440090525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10758532 (or 10758527 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 621440090525 in words is "six hundred twenty-one billion, four hundred forty million, ninety thousand, five hundred twenty-five".