156861685 has 8 divisors (see below), whose sum is σ = 193321656. Its totient is φ = 122097600.

The previous prime is 156861671. The next prime is 156861713. The reversal of 156861685 is 586168651.

156861685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 70408881 + 86452804 = 8391^2 + 9298^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 156861685 - 2⁷ = 156861557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 423766 + ... + 424135.

It is an arithmetic number, because the mean of its divisors is an integer number (24165207).

Almost surely, 2^156861685 is an apocalyptic number.

It is an amenable number.

156861685 is a deficient number, since it is larger than the sum of its proper divisors (36459971).

156861685 is an equidigital number, since it uses as much as digits as its factorization.

156861685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847943.

The product of its digits is 345600, while the sum is 46.

The square root of 156861685 is about 12524.4435006111. The cubic root of 156861685 is about 539.3106028725.

It can be divided in two parts, 15686 and 1685, that added together give a palindrome (17371).

The spelling of 156861685 in words is "one hundred fifty-six million, eight hundred sixty-one thousand, six hundred eighty-five".