157996805 has 8 divisors (see below), whose sum is σ = 191727000. Its totient is φ = 124976896.

The previous prime is 157996789. The next prime is 157996819. The reversal of 157996805 is 508699751.

It is a happy number.

157996805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 35628961 + 122367844 = 5969^2 + 11062^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 157996805 - 2⁴ = 157996789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177080 + ... + 177969.

It is an arithmetic number, because the mean of its divisors is an integer number (23965875).

Almost surely, 2^157996805 is an apocalyptic number.

It is an amenable number.

157996805 is a deficient number, since it is larger than the sum of its proper divisors (33730195).

157996805 is an equidigital number, since it uses as much as digits as its factorization.

157996805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355143.

The product of its (nonzero) digits is 680400, while the sum is 50.

The square root of 157996805 is about 12569.6779990579. The cubic root of 157996805 is about 540.6083735517.

The spelling of 157996805 in words is "one hundred fifty-seven million, nine hundred ninety-six thousand, eight hundred five".