621661524031 has 16 divisors (see below), whose sum is σ = 665441457408. Its totient is φ = 578696918400.

The previous prime is 621661524013. The next prime is 621661524037. The reversal of 621661524031 is 130425166126.

621661524031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 621661524031 - 2¹¹ = 621661521983 is a prime.

It is a super-2 number, since 2×621661524031² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621661524037) 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, 1201176 + ... + 1638946.

It is an arithmetic number, because the mean of its divisors is an integer number (41590091088).

Almost surely, 2^621661524031 is an apocalyptic number.

621661524031 is a deficient number, since it is larger than the sum of its proper divisors (43779933377).

621661524031 is a wasteful number, since it uses less digits than its factorization.

621661524031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438702.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 621661524031 in words is "six hundred twenty-one billion, six hundred sixty-one million, five hundred twenty-four thousand, thirty-one".