72345487637 has 2 divisors, whose sum is σ = 72345487638. Its totient is φ = 72345487636.

The previous prime is 72345487633. The next prime is 72345487667. The reversal of 72345487637 is 73678454327.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53264485681 + 19081001956 = 230791^2 + 138134^2 .

It is an emirp because it is prime and its reverse (73678454327) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72345487637 - 2² = 72345487633 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72345487633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36172743818 + 36172743819.

It is an arithmetic number, because the mean of its divisors is an integer number (36172743819).

Almost surely, 2^72345487637 is an apocalyptic number.

It is an amenable number.

72345487637 is a deficient number, since it is larger than the sum of its proper divisors (1).

72345487637 is an equidigital number, since it uses as much as digits as its factorization.

72345487637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23708160, while the sum is 56.

The spelling of 72345487637 in words is "seventy-two billion, three hundred forty-five million, four hundred eighty-seven thousand, six hundred thirty-seven".