72551221822 has 12 divisors (see below), whose sum is σ = 109016768160. Its totient is φ = 36212409216.

The previous prime is 72551221807. The next prime is 72551221823. The reversal of 72551221822 is 22812215527.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72551221823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 611379 + ... + 720337.

It is an arithmetic number, because the mean of its divisors is an integer number (9084730680).

Almost surely, 2^72551221822 is an apocalyptic number.

72551221822 is a deficient number, since it is larger than the sum of its proper divisors (36465546338).

72551221822 is an equidigital number, since it uses as much as digits as its factorization.

72551221822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110115 (or 109538 counting only the distinct ones).

The product of its digits is 44800, while the sum is 37.

The spelling of 72551221822 in words is "seventy-two billion, five hundred fifty-one million, two hundred twenty-one thousand, eight hundred twenty-two".