157685561 has 8 divisors (see below), whose sum is σ = 177570048. Its totient is φ = 138726000.

The previous prime is 157685537. The next prime is 157685569. The reversal of 157685561 is 165586751.

It is a happy number.

157685561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 157685561 - 2¹⁴ = 157669177 is a prime.

It is a super-2 number, since 2×157685561² = 49729472295769442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157685569) 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, 230870 + ... + 231551.

It is an arithmetic number, because the mean of its divisors is an integer number (22196256).

Almost surely, 2^157685561 is an apocalyptic number.

157685561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

157685561 is a deficient number, since it is larger than the sum of its proper divisors (19884487).

157685561 is a wasteful number, since it uses less digits than its factorization.

157685561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462463.

The product of its digits is 252000, while the sum is 44.

The square root of 157685561 is about 12557.2911489700. The cubic root of 157685561 is about 540.2531517658.

The spelling of 157685561 in words is "one hundred fifty-seven million, six hundred eighty-five thousand, five hundred sixty-one".