72061657222 has 4 divisors (see below), whose sum is σ = 108092485836. Its totient is φ = 36030828610.

The previous prime is 72061657207. The next prime is 72061657237. The reversal of 72061657222 is 22275616027.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (72061657207) and next prime (72061657237).

It is a super-4 number, since 4×72061657222⁴ (a number of 45 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18015414304 + ... + 18015414307.

It is an arithmetic number, because the mean of its divisors is an integer number (27023121459).

Almost surely, 2^72061657222 is an apocalyptic number.

72061657222 is a deficient number, since it is larger than the sum of its proper divisors (36030828614).

72061657222 is a wasteful number, since it uses less digits than its factorization.

72061657222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36030828613.

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 72061657222 in words is "seventy-two billion, sixty-one million, six hundred fifty-seven thousand, two hundred twenty-two".