156661243 has 4 divisors (see below), whose sum is σ = 156686488. Its totient is φ = 156636000.

The previous prime is 156661229. The next prime is 156661247. The reversal of 156661243 is 342166651.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 156661243 - 2⁹ = 156660731 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 156661199 and 156661208.

It is not an unprimeable number, because it can be changed into a prime (156661247) 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, 3868 + ... + 18118.

It is an arithmetic number, because the mean of its divisors is an integer number (39171622).

Almost surely, 2^156661243 is an apocalyptic number.

156661243 is a deficient number, since it is larger than the sum of its proper divisors (25245).

156661243 is a wasteful number, since it uses less digits than its factorization.

156661243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25244.

The product of its digits is 25920, while the sum is 34.

The square root of 156661243 is about 12516.4389104889. The cubic root of 156661243 is about 539.0807898515.

The spelling of 156661243 in words is "one hundred fifty-six million, six hundred sixty-one thousand, two hundred forty-three".