72140470651 has 4 divisors (see below), whose sum is σ = 73009633032. Its totient is φ = 71271308272.

The previous prime is 72140470637. The next prime is 72140470679. The reversal of 72140470651 is 15607404127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72140470651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72140470651.

It is not an unprimeable number, because it can be changed into a prime (72140470621) 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, 434581066 + ... + 434581231.

It is an arithmetic number, because the mean of its divisors is an integer number (18252408258).

Almost surely, 2^72140470651 is an apocalyptic number.

72140470651 is a deficient number, since it is larger than the sum of its proper divisors (869162381).

72140470651 is an equidigital number, since it uses as much as digits as its factorization.

72140470651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869162380.

The product of its (nonzero) digits is 47040, while the sum is 37.

Adding to 72140470651 its reverse (15607404127), we get a palindrome (87747874778).

The spelling of 72140470651 in words is "seventy-two billion, one hundred forty million, four hundred seventy thousand, six hundred fifty-one".