72191222693 has 4 divisors (see below), whose sum is σ = 72265114380. Its totient is φ = 72117331008.

The previous prime is 72191222669. The next prime is 72191222717. The reversal of 72191222693 is 39622219127.

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 (72191222669) and next prime (72191222717).

It can be written as a sum of positive squares in 2 ways, for example, as 67858687009 + 4332535684 = 260497^2 + 65822^2 .

It is a cyclic number.

It is not a de Polignac number, because 72191222693 - 2¹⁸ = 72190960549 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 (72191222633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36944378 + ... + 36946331.

It is an arithmetic number, because the mean of its divisors is an integer number (18066278595).

Almost surely, 2^72191222693 is an apocalyptic number.

It is an amenable number.

72191222693 is a deficient number, since it is larger than the sum of its proper divisors (73891687).

72191222693 is an equidigital number, since it uses as much as digits as its factorization.

72191222693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73891686.

The product of its digits is 163296, while the sum is 44.

The spelling of 72191222693 in words is "seventy-two billion, one hundred ninety-one million, two hundred twenty-two thousand, six hundred ninety-three".