72225552661 has 8 divisors (see below), whose sum is σ = 72645995840. Its totient is φ = 71806273632.

The previous prime is 72225552649. The next prime is 72225552677. The reversal of 72225552661 is 16625552227.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72225552661 - 2³⁵ = 37865814293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72225552601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166440 + ... + 414913.

It is an arithmetic number, because the mean of its divisors is an integer number (9080749480).

Almost surely, 2^72225552661 is an apocalyptic number.

It is an amenable number.

72225552661 is a deficient number, since it is larger than the sum of its proper divisors (420443179).

72225552661 is a wasteful number, since it uses less digits than its factorization.

72225552661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582075.

The product of its digits is 504000, while the sum is 43.

The spelling of 72225552661 in words is "seventy-two billion, two hundred twenty-five million, five hundred fifty-two thousand, six hundred sixty-one".