73157539897 has 4 divisors (see below), whose sum is σ = 78785042980. Its totient is φ = 67530036816.

The previous prime is 73157539853. The next prime is 73157539901. The reversal of 73157539897 is 79893575137.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79893575137 = 19603 ⋅4075579.

It can be written as a sum of positive squares in 2 ways, for example, as 47499587136 + 25657952761 = 217944^2 + 160181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73157539897 is a prime.

It is a super-2 number, since 2×73157539897² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73157539297) 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, 2813751522 + ... + 2813751547.

It is an arithmetic number, because the mean of its divisors is an integer number (19696260745).

Almost surely, 2^73157539897 is an apocalyptic number.

It is an amenable number.

73157539897 is a deficient number, since it is larger than the sum of its proper divisors (5627503083).

73157539897 is a wasteful number, since it uses less digits than its factorization.

73157539897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5627503082.

The product of its digits is 50009400, while the sum is 64.

The spelling of 73157539897 in words is "seventy-three billion, one hundred fifty-seven million, five hundred thirty-nine thousand, eight hundred ninety-seven".