137765525891 has 4 divisors (see below), whose sum is σ = 157446315312. Its totient is φ = 118084736472.

The previous prime is 137765525861. The next prime is 137765525903. The reversal of 137765525891 is 198525567731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198525567731 = 244313 ⋅812587.

It is a cyclic number.

It is not a de Polignac number, because 137765525891 - 2⁶ = 137765525827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137765525891.

It is not an unprimeable number, because it can be changed into a prime (137765525861) 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, 9840394700 + ... + 9840394713.

It is an arithmetic number, because the mean of its divisors is an integer number (39361578828).

Almost surely, 2^137765525891 is an apocalyptic number.

137765525891 is a deficient number, since it is larger than the sum of its proper divisors (19680789421).

137765525891 is an equidigital number, since it uses as much as digits as its factorization.

137765525891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19680789420.

The product of its digits is 15876000, while the sum is 59.

The spelling of 137765525891 in words is "one hundred thirty-seven billion, seven hundred sixty-five million, five hundred twenty-five thousand, eight hundred ninety-one".