157122020765 has 4 divisors (see below), whose sum is σ = 188546424924. Its totient is φ = 125697616608.

The previous prime is 157122020749. The next prime is 157122020789. The reversal of 157122020765 is 567020221751.

157122020765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 567020221751 = 37483 ⋅15127397.

It can be written as a sum of positive squares in 2 ways, for example, as 24324457369 + 132797563396 = 155963^2 + 364414^2 .

It is a cyclic number.

It is not a de Polignac number, because 157122020765 - 2⁴ = 157122020749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15712202072 + ... + 15712202081.

It is an arithmetic number, because the mean of its divisors is an integer number (47136606231).

Almost surely, 2^157122020765 is an apocalyptic number.

It is an amenable number.

157122020765 is a deficient number, since it is larger than the sum of its proper divisors (31424404159).

157122020765 is an equidigital number, since it uses as much as digits as its factorization.

157122020765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31424404158.

The product of its (nonzero) digits is 58800, while the sum is 38.

The spelling of 157122020765 in words is "one hundred fifty-seven billion, one hundred twenty-two million, twenty thousand, seven hundred sixty-five".