157681551 has 32 divisors (see below), whose sum is σ = 227046400. Its totient is φ = 97314048.

The previous prime is 157681547. The next prime is 157681591. The reversal of 157681551 is 155186751.

157681551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 157681551 - 2² = 157681547 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 (157681501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1625535 + ... + 1625631.

It is an arithmetic number, because the mean of its divisors is an integer number (7095200).

Almost surely, 2^157681551 is an apocalyptic number.

157681551 is a deficient number, since it is larger than the sum of its proper divisors (69364849).

157681551 is an frugal number, since it uses more digits than its factorization.

157681551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 198 counting only the distinct ones).

The product of its digits is 42000, while the sum is 39.

The square root of 157681551 is about 12557.1314797608. The cubic root of 157681551 is about 540.2485721170.

The spelling of 157681551 in words is "one hundred fifty-seven million, six hundred eighty-one thousand, five hundred fifty-one".