157776774145 has 4 divisors (see below), whose sum is σ = 189332128980. Its totient is φ = 126221419312.

The previous prime is 157776774131. The next prime is 157776774157. The reversal of 157776774145 is 541477677751.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 118115255041 + 39661519104 = 343679^2 + 199152^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157776774145 is a prime.

It is a super-3 number, since 3×157776774145³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15777677410 + ... + 15777677419.

It is an arithmetic number, because the mean of its divisors is an integer number (47333032245).

Almost surely, 2^157776774145 is an apocalyptic number.

It is an amenable number.

157776774145 is a deficient number, since it is larger than the sum of its proper divisors (31555354835).

157776774145 is an equidigital number, since it uses as much as digits as its factorization.

157776774145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31555354834.

The product of its digits is 40336800, while the sum is 61.

The spelling of 157776774145 in words is "one hundred fifty-seven billion, seven hundred seventy-six million, seven hundred seventy-four thousand, one hundred forty-five".