157817965 has 4 divisors (see below), whose sum is σ = 189381564. Its totient is φ = 126254368.

The previous prime is 157817951. The next prime is 157817983. The reversal of 157817965 is 569718751.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 569718751 = 7 ⋅81388393.

It can be written as a sum of positive squares in 2 ways, for example, as 98049604 + 59768361 = 9902^2 + 7731^2 .

It is a cyclic number.

It is not a de Polignac number, because 157817965 - 2⁹ = 157817453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 15781792 + ... + 15781801.

It is an arithmetic number, because the mean of its divisors is an integer number (47345391).

Almost surely, 2^157817965 is an apocalyptic number.

It is an amenable number.

157817965 is a deficient number, since it is larger than the sum of its proper divisors (31563599).

157817965 is an equidigital number, since it uses as much as digits as its factorization.

157817965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31563598.

The product of its digits is 529200, while the sum is 49.

The square root of 157817965 is about 12562.5620396478. The cubic root of 157817965 is about 540.4043211060.

The spelling of 157817965 in words is "one hundred fifty-seven million, eight hundred seventeen thousand, nine hundred sixty-five".