72404543347761 has 4 divisors (see below), whose sum is σ = 96539391130352. Its totient is φ = 48269695565172.

The previous prime is 72404543347757. The next prime is 72404543347819. The reversal of 72404543347761 is 16774334540427.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 72404543347761 - 2² = 72404543347757 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72404543347751) 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, 12067423891291 + ... + 12067423891296.

It is an arithmetic number, because the mean of its divisors is an integer number (24134847782588).

Almost surely, 2^{72404543347761} is an apocalyptic number.

It is an amenable number.

72404543347761 is a deficient number, since it is larger than the sum of its proper divisors (24134847782591).

72404543347761 is a wasteful number, since it uses less digits than its factorization.

72404543347761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24134847782590.

The product of its (nonzero) digits is 47416320, while the sum is 57.

The spelling of 72404543347761 in words is "seventy-two trillion, four hundred four billion, five hundred forty-three million, three hundred forty-seven thousand, seven hundred sixty-one".