157191740609 has 4 divisors (see below), whose sum is σ = 166438313604. Its totient is φ = 147945167616.

The previous prime is 157191740599. The next prime is 157191740639. The reversal of 157191740609 is 906047191751.

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 125553292225 + 31638448384 = 354335^2 + 177872^2 .

It is a cyclic number.

It is not a de Polignac number, because 157191740609 - 2²⁰ = 157190692033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157191740639) 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, 4623286472 + ... + 4623286505.

It is an arithmetic number, because the mean of its divisors is an integer number (41609578401).

Almost surely, 2^157191740609 is an apocalyptic number.

It is an amenable number.

157191740609 is a deficient number, since it is larger than the sum of its proper divisors (9246572995).

157191740609 is an equidigital number, since it uses as much as digits as its factorization.

157191740609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9246572994.

The product of its (nonzero) digits is 476280, while the sum is 50.

The spelling of 157191740609 in words is "one hundred fifty-seven billion, one hundred ninety-one million, seven hundred forty thousand, six hundred nine".