157908643 has 4 divisors (see below), whose sum is σ = 157982400. Its totient is φ = 157834888.

The previous prime is 157908629. The next prime is 157908661. The reversal of 157908643 is 346809751.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157908643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 157908643.

It is not an unprimeable number, because it can be changed into a prime (157908613) 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, 33568 + ... + 37981.

It is an arithmetic number, because the mean of its divisors is an integer number (39495600).

Almost surely, 2^157908643 is an apocalyptic number.

157908643 is a deficient number, since it is larger than the sum of its proper divisors (73757).

157908643 is an equidigital number, since it uses as much as digits as its factorization.

157908643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73756.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 157908643 is about 12566.1705781833. The cubic root of 157908643 is about 540.5078019334.

The spelling of 157908643 in words is "one hundred fifty-seven million, nine hundred eight thousand, six hundred forty-three".