72174687643 has 4 divisors (see below), whose sum is σ = 72177535080. Its totient is φ = 72171840208.

The previous prime is 72174687617. The next prime is 72174687647. The reversal of 72174687643 is 34678647127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34678647127 = 487 ⋅71208721.

It is a cyclic number.

It is not a de Polignac number, because 72174687643 - 2³³ = 63584753051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72174687647) 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, 1385353 + ... + 1436506.

It is an arithmetic number, because the mean of its divisors is an integer number (18044383770).

Almost surely, 2^72174687643 is an apocalyptic number.

72174687643 is a deficient number, since it is larger than the sum of its proper divisors (2847437).

72174687643 is a wasteful number, since it uses less digits than its factorization.

72174687643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847436.

The product of its digits is 9483264, while the sum is 55.

The spelling of 72174687643 in words is "seventy-two billion, one hundred seventy-four million, six hundred eighty-seven thousand, six hundred forty-three".