73519636561 has 4 divisors (see below), whose sum is σ = 84022441792. Its totient is φ = 63016831332.

The previous prime is 73519636529. The next prime is 73519636573. The reversal of 73519636561 is 16563691537.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16563691537 = 839 ⋅19742183.

It is not a de Polignac number, because 73519636561 - 2⁵ = 73519636529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73519636499 and 73519636508.

It is not an unprimeable number, because it can be changed into a prime (73519636361) 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, 5251402605 + ... + 5251402618.

It is an arithmetic number, because the mean of its divisors is an integer number (21005610448).

Almost surely, 2^73519636561 is an apocalyptic number.

It is an amenable number.

73519636561 is a deficient number, since it is larger than the sum of its proper divisors (10502805231).

73519636561 is a wasteful number, since it uses less digits than its factorization.

73519636561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10502805230.

The product of its digits is 3061800, while the sum is 52.

The spelling of 73519636561 in words is "seventy-three billion, five hundred nineteen million, six hundred thirty-six thousand, five hundred sixty-one".