72187441951 has 4 divisors (see below), whose sum is σ = 72231008752. Its totient is φ = 72143875152.

The previous prime is 72187441939. The next prime is 72187441967. The reversal of 72187441951 is 15914478127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15914478127 = 14983 ⋅1062169.

It is a cyclic number.

It is not a de Polignac number, because 72187441951 - 2⁹ = 72187441439 is a prime.

It is a super-2 number, since 2×72187441951² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72187441895 and 72187441904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72187441901) 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, 21780915 + ... + 21784228.

It is an arithmetic number, because the mean of its divisors is an integer number (18057752188).

Almost surely, 2^72187441951 is an apocalyptic number.

72187441951 is a deficient number, since it is larger than the sum of its proper divisors (43566801).

72187441951 is a wasteful number, since it uses less digits than its factorization.

72187441951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43566800.

The product of its digits is 564480, while the sum is 49.

The spelling of 72187441951 in words is "seventy-two billion, one hundred eighty-seven million, four hundred forty-one thousand, nine hundred fifty-one".