7621431361636 has 81 divisors (see below), whose sum is σ = 13829708876011. Its totient is φ = 3675035852800.

The previous prime is 7621431361631. The next prime is 7621431361667. The reversal of 7621431361636 is 6361631341267.

The square root of 7621431361636 is 2760694.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 70718764900 + 7550712596736 = 265930^2 + 2747856^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7621431361636.

It is not an unprimeable number, because it can be changed into a prime (7621431361631) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 29655374820 + ... + 29655375076.

Almost surely, 2^{7621431361636} is an apocalyptic number.

7621431361636 is the 2760694-th square number.

It is an amenable number.

7621431361636 is a deficient number, since it is larger than the sum of its proper divisors (6208277514375).

7621431361636 is an equidigital number, since it uses as much as digits as its factorization.

7621431361636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862 (or 431 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 49.

Multiplying 7621431361636 by its sum of digits (49), we get a square (373450136720164 = 19324858²).

The spelling of 7621431361636 in words is "seven trillion, six hundred twenty-one billion, four hundred thirty-one million, three hundred sixty-one thousand, six hundred thirty-six".