157998505 has 16 divisors (see below), whose sum is σ = 216892800. Its totient is φ = 108237312.

The previous prime is 157998497. The next prime is 157998517. The reversal of 157998505 is 505899751.

It is a cyclic number.

It is not a de Polignac number, because 157998505 - 2³ = 157998497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58137 + ... + 60793.

It is an arithmetic number, because the mean of its divisors is an integer number (13555800).

Almost surely, 2^157998505 is an apocalyptic number.

It is an amenable number.

157998505 is a deficient number, since it is larger than the sum of its proper divisors (58894295).

157998505 is a wasteful number, since it uses less digits than its factorization.

157998505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4368.

The product of its (nonzero) digits is 567000, while the sum is 49.

The square root of 157998505 is about 12569.7456219289. The cubic root of 157998505 is about 540.6103124748.

The spelling of 157998505 in words is "one hundred fifty-seven million, nine hundred ninety-eight thousand, five hundred five".