157667491 has 4 divisors (see below), whose sum is σ = 165965800. Its totient is φ = 149369184.

The previous prime is 157667459. The next prime is 157667557. The reversal of 157667491 is 194766751.

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

It is not a de Polignac number, because 157667491 - 2⁵ = 157667459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157667441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4149126 + ... + 4149163.

It is an arithmetic number, because the mean of its divisors is an integer number (41491450).

Almost surely, 2^157667491 is an apocalyptic number.

157667491 is a deficient number, since it is larger than the sum of its proper divisors (8298309).

157667491 is an equidigital number, since it uses as much as digits as its factorization.

157667491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8298308.

The product of its digits is 317520, while the sum is 46.

The square root of 157667491 is about 12556.5716260451. The cubic root of 157667491 is about 540.2325141811.

The spelling of 157667491 in words is "one hundred fifty-seven million, six hundred sixty-seven thousand, four hundred ninety-one".