185201311157 has 4 divisors (see below), whose sum is σ = 185203185036. Its totient is φ = 185199437280.

The previous prime is 185201311123. The next prime is 185201311159. The reversal of 185201311157 is 751113102581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 751113102581 = 141833 ⋅5295757.

It can be written as a sum of positive squares in 2 ways, for example, as 105356071396 + 79845239761 = 324586^2 + 282569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-185201311157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (185201311159) 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, 779918 + ... + 989279.

It is an arithmetic number, because the mean of its divisors is an integer number (46300796259).

Almost surely, 2^185201311157 is an apocalyptic number.

It is an amenable number.

185201311157 is a deficient number, since it is larger than the sum of its proper divisors (1873879).

185201311157 is a wasteful number, since it uses less digits than its factorization.

185201311157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1873878.

The product of its (nonzero) digits is 8400, while the sum is 35.

The spelling of 185201311157 in words is "one hundred eighty-five billion, two hundred one million, three hundred eleven thousand, one hundred fifty-seven".