157776381 has 24 divisors (see below), whose sum is σ = 260929344. Its totient is φ = 89994240.

The previous prime is 157776349. The next prime is 157776383. The reversal of 157776381 is 183677751.

157776381 is a `hidden beast` number, since 1 + 5 + 7 + 7 + 7 + 638 + 1 = 666.

It is not a de Polignac number, because 157776381 - 2⁵ = 157776349 is a prime.

It is a super-2 number, since 2×157776381² = 49786772802914322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157776383) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 38430 + ... + 42336.

It is an arithmetic number, because the mean of its divisors is an integer number (10872056).

Almost surely, 2^157776381 is an apocalyptic number.

It is an amenable number.

157776381 is a deficient number, since it is larger than the sum of its proper divisors (103152963).

157776381 is a wasteful number, since it uses less digits than its factorization.

157776381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4561 (or 4558 counting only the distinct ones).

The product of its digits is 246960, while the sum is 45.

The square root of 157776381 is about 12560.9068542044. The cubic root of 157776381 is about 540.3568526036.

The spelling of 157776381 in words is "one hundred fifty-seven million, seven hundred seventy-six thousand, three hundred eighty-one".