7221331637156 has 72 divisors (see below), whose sum is σ = 16377290750520. Its totient is φ = 2758280491008.

The previous prime is 7221331637131. The next prime is 7221331637231. The reversal of 7221331637156 is 6517361331227.

It can be written as a sum of positive squares in 4 ways, for example, as 888136608100 + 6333195029056 = 942410^2 + 2516584^2 .

It is a super-2 number, since 2×7221331637156² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7221331637156.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48790205 + ... + 48937988.

It is an arithmetic number, because the mean of its divisors is an integer number (227462371535).

Almost surely, 2^{7221331637156} is an apocalyptic number.

It is an amenable number.

7221331637156 is an abundant number, since it is smaller than the sum of its proper divisors (9155959113364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7221331637156 is a wasteful number, since it uses less digits than its factorization.

7221331637156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97728253 (or 97728244 counting only the distinct ones).

The product of its digits is 952560, while the sum is 47.

The spelling of 7221331637156 in words is "seven trillion, two hundred twenty-one billion, three hundred thirty-one million, six hundred thirty-seven thousand, one hundred fifty-six".