73955518817 has 4 divisors (see below), whose sum is σ = 74368678320. Its totient is φ = 73542359316.

The previous prime is 73955518709. The next prime is 73955518849. The reversal of 73955518817 is 71881555937.

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: 71881555937 = 2069 ⋅34742173.

It is a cyclic number.

It is not a de Polignac number, because 73955518817 - 2⁸ = 73955518561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73955508817) 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, 206579483 + ... + 206579840.

It is an arithmetic number, because the mean of its divisors is an integer number (18592169580).

Almost surely, 2^73955518817 is an apocalyptic number.

It is an amenable number.

73955518817 is a deficient number, since it is larger than the sum of its proper divisors (413159503).

73955518817 is a wasteful number, since it uses less digits than its factorization.

73955518817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413159502.

The product of its digits is 10584000, while the sum is 59.

The spelling of 73955518817 in words is "seventy-three billion, nine hundred fifty-five million, five hundred eighteen thousand, eight hundred seventeen".