157443171491 has 4 divisors (see below), whose sum is σ = 162872246400. Its totient is φ = 152014096584.

The previous prime is 157443171451. The next prime is 157443171497. The reversal of 157443171491 is 194171344751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194171344751 = 3767 ⋅51545353.

It is a cyclic number.

It is not a de Polignac number, because 157443171491 - 2²² = 157438977187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157443171497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2714537411 + ... + 2714537468.

It is an arithmetic number, because the mean of its divisors is an integer number (40718061600).

Almost surely, 2^157443171491 is an apocalyptic number.

157443171491 is a deficient number, since it is larger than the sum of its proper divisors (5429074909).

157443171491 is an equidigital number, since it uses as much as digits as its factorization.

157443171491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5429074908.

The product of its digits is 423360, while the sum is 47.

The spelling of 157443171491 in words is "one hundred fifty-seven billion, four hundred forty-three million, one hundred seventy-one thousand, four hundred ninety-one".