157644243 has 6 divisors (see below), whose sum is σ = 227708364. Its totient is φ = 105096156.

The previous prime is 157644239. The next prime is 157644257. The reversal of 157644243 is 342446751.

157644243 is a `hidden beast` number, since 1 + 5 + 7 + 644 + 2 + 4 + 3 = 666.

It is not a de Polignac number, because 157644243 - 2² = 157644239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 157644198 and 157644207.

It is not an unprimeable number, because it can be changed into a prime (157644343) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8758005 + ... + 8758022.

It is an arithmetic number, because the mean of its divisors is an integer number (37951394).

Almost surely, 2^157644243 is an apocalyptic number.

157644243 is a deficient number, since it is larger than the sum of its proper divisors (70064121).

157644243 is a wasteful number, since it uses less digits than its factorization.

157644243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17516033 (or 17516030 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 157644243 is about 12555.6458615238. The cubic root of 157644243 is about 540.2059605296.

The spelling of 157644243 in words is "one hundred fifty-seven million, six hundred forty-four thousand, two hundred forty-three".