72170279561 has 8 divisors (see below), whose sum is σ = 75503522304. Its totient is φ = 68911941280.

The previous prime is 72170279551. The next prime is 72170279567. The reversal of 72170279561 is 16597207127.

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 72170279561 - 2²⁶ = 72103170697 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72170279567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18724145 + ... + 18727998.

It is an arithmetic number, because the mean of its divisors is an integer number (9437940288).

Almost surely, 2^72170279561 is an apocalyptic number.

It is an amenable number.

72170279561 is a deficient number, since it is larger than the sum of its proper divisors (3333242743).

72170279561 is a wasteful number, since it uses less digits than its factorization.

72170279561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37452231.

The product of its (nonzero) digits is 370440, while the sum is 47.

The spelling of 72170279561 in words is "seventy-two billion, one hundred seventy million, two hundred seventy-nine thousand, five hundred sixty-one".