7209681638164 has 24 divisors (see below), whose sum is σ = 13363825222440. Its totient is φ = 3391595360256.

The previous prime is 7209681638141. The next prime is 7209681638179. The reversal of 7209681638164 is 4618361869027.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 45804560400 + 7163877077764 = 214020^2 + 2676542^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18493149 + ... + 18878980.

It is an arithmetic number, because the mean of its divisors is an integer number (556826050935).

Almost surely, 2^{7209681638164} is an apocalyptic number.

It is an amenable number.

7209681638164 is a deficient number, since it is larger than the sum of its proper divisors (6154143584276).

7209681638164 is a wasteful number, since it uses less digits than its factorization.

7209681638164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37374987 (or 37374985 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 61.

The spelling of 7209681638164 in words is "seven trillion, two hundred nine billion, six hundred eighty-one million, six hundred thirty-eight thousand, one hundred sixty-four".