157685447 has 4 divisors (see below), whose sum is σ = 164541360. Its totient is φ = 150829536.

The previous prime is 157685443. The next prime is 157685449. The reversal of 157685447 is 744586751.

157685447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744586751 = 23 ⋅32373337.

It is a cyclic number.

It is not a de Polignac number, because 157685447 - 2² = 157685443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157685443) 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, 3427922 + ... + 3427967.

It is an arithmetic number, because the mean of its divisors is an integer number (41135340).

Almost surely, 2^157685447 is an apocalyptic number.

157685447 is a deficient number, since it is larger than the sum of its proper divisors (6855913).

157685447 is an equidigital number, since it uses as much as digits as its factorization.

157685447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6855912.

The product of its digits is 940800, while the sum is 47.

The square root of 157685447 is about 12557.2866097736. The cubic root of 157685447 is about 540.2530215724.

The spelling of 157685447 in words is "one hundred fifty-seven million, six hundred eighty-five thousand, four hundred forty-seven".