621603342631 has 4 divisors (see below), whose sum is σ = 621627936264. Its totient is φ = 621578749000.

The previous prime is 621603342559. The next prime is 621603342683. The reversal of 621603342631 is 136243306126.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 621603342631 - 2¹³ = 621603334439 is a prime.

It is a super-2 number, since 2×621603342631² (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 (621603342331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12258865 + ... + 12309466.

It is an arithmetic number, because the mean of its divisors is an integer number (155406984066).

Almost surely, 2^621603342631 is an apocalyptic number.

621603342631 is a deficient number, since it is larger than the sum of its proper divisors (24593633).

621603342631 is a wasteful number, since it uses less digits than its factorization.

621603342631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24593632.

The product of its (nonzero) digits is 93312, while the sum is 37.

Adding to 621603342631 its reverse (136243306126), we get a palindrome (757846648757).

The spelling of 621603342631 in words is "six hundred twenty-one billion, six hundred three million, three hundred forty-two thousand, six hundred thirty-one".