611630731621 has 24 divisors (see below), whose sum is σ = 767635452024. Its totient is φ = 483032833920.

The previous prime is 611630731577. The next prime is 611630731633. The reversal of 611630731621 is 126137036116.

It can be written as a sum of positive squares in 4 ways, for example, as 69366390625 + 542264340996 = 263375^2 + 736386^2 .

It is not a de Polignac number, because 611630731621 - 2¹⁷ = 611630600549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611630731121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 542790 + ... + 1232023.

It is an arithmetic number, because the mean of its divisors is an integer number (31984810501).

Almost surely, 2^611630731621 is an apocalyptic number.

It is an amenable number.

611630731621 is a deficient number, since it is larger than the sum of its proper divisors (156004720403).

611630731621 is a wasteful number, since it uses less digits than its factorization.

611630731621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775381 (or 1775374 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 37.

Adding to 611630731621 its reverse (126137036116), we get a palindrome (737767767737).

The spelling of 611630731621 in words is "six hundred eleven billion, six hundred thirty million, seven hundred thirty-one thousand, six hundred twenty-one".