157171715861 has 4 divisors (see below), whose sum is σ = 157203517632. Its totient is φ = 157139914092.

The previous prime is 157171715851. The next prime is 157171715917. The reversal of 157171715861 is 168517171751.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 168517171751 = 19 ⋅8869324829.

It is a cyclic number.

It is not a de Polignac number, because 157171715861 - 2³⁰ = 156097974037 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 (157171715821) 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, 15893471 + ... + 15903356.

It is an arithmetic number, because the mean of its divisors is an integer number (39300879408).

Almost surely, 2^157171715861 is an apocalyptic number.

It is an amenable number.

157171715861 is a deficient number, since it is larger than the sum of its proper divisors (31801771).

157171715861 is an equidigital number, since it uses as much as digits as its factorization.

157171715861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31801770.

The product of its digits is 411600, while the sum is 50.

The spelling of 157171715861 in words is "one hundred fifty-seven billion, one hundred seventy-one million, seven hundred fifteen thousand, eight hundred sixty-one".