72326557811 has 4 divisors (see below), whose sum is σ = 72329650872. Its totient is φ = 72323464752.

The previous prime is 72326557801. The next prime is 72326557843. The reversal of 72326557811 is 11875562327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11875562327 = 677 ⋅17541451.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72326557811 is a prime.

It is a super-2 number, since 2×72326557811² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72326557801) 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, 1511186 + ... + 1558311.

It is an arithmetic number, because the mean of its divisors is an integer number (18082412718).

Almost surely, 2^72326557811 is an apocalyptic number.

72326557811 is a deficient number, since it is larger than the sum of its proper divisors (3093061).

72326557811 is a wasteful number, since it uses less digits than its factorization.

72326557811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3093060.

The product of its digits is 705600, while the sum is 47.

The spelling of 72326557811 in words is "seventy-two billion, three hundred twenty-six million, five hundred fifty-seven thousand, eight hundred eleven".