185193157993 has 4 divisors (see below), whose sum is σ = 185194492288. Its totient is φ = 185191823700.

The previous prime is 185193157973. The next prime is 185193157997. The reversal of 185193157993 is 399751391581.

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: 399751391581 = 41 ⋅9750033941.

It is a cyclic number.

It is not a de Polignac number, because 185193157993 - 2⁹ = 185193157481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (185193157997) 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, 431121 + ... + 745822.

It is an arithmetic number, because the mean of its divisors is an integer number (46298623072).

Almost surely, 2^185193157993 is an apocalyptic number.

It is an amenable number.

185193157993 is a deficient number, since it is larger than the sum of its proper divisors (1334295).

185193157993 is a wasteful number, since it uses less digits than its factorization.

185193157993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334294.

The product of its digits is 9185400, while the sum is 61.

It can be divided in two parts, 1851931 and 57993, that added together give a square (1909924 = 1382²).

The spelling of 185193157993 in words is "one hundred eighty-five billion, one hundred ninety-three million, one hundred fifty-seven thousand, nine hundred ninety-three".