157808561 has 8 divisors (see below), whose sum is σ = 159776064. Its totient is φ = 155849200.

The previous prime is 157808533. The next prime is 157808591. The reversal of 157808561 is 165808751.

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 157808561 - 2¹⁰ = 157807537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157808531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42980 + ... + 46506.

It is an arithmetic number, because the mean of its divisors is an integer number (19972008).

Almost surely, 2^157808561 is an apocalyptic number.

It is an amenable number.

157808561 is a deficient number, since it is larger than the sum of its proper divisors (1967503).

157808561 is a wasteful number, since it uses less digits than its factorization.

157808561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4071.

The product of its (nonzero) digits is 67200, while the sum is 41.

The square root of 157808561 is about 12562.1877473631. The cubic root of 157808561 is about 540.3935870868.

The spelling of 157808561 in words is "one hundred fifty-seven million, eight hundred eight thousand, five hundred sixty-one".