157685641 has 4 divisors (see below), whose sum is σ = 159585552. Its totient is φ = 155785732.

The previous prime is 157685609. The next prime is 157685651. The reversal of 157685641 is 146586751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 146586751 = 23 ⋅6373337.

It is a cyclic number.

It is not a de Polignac number, because 157685641 - 2⁵ = 157685609 is a prime.

It is a super-2 number, since 2×157685641² = 49729522755161762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157685651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 949831 + ... + 949996.

It is an arithmetic number, because the mean of its divisors is an integer number (39896388).

Almost surely, 2^157685641 is an apocalyptic number.

It is an amenable number.

157685641 is a deficient number, since it is larger than the sum of its proper divisors (1899911).

157685641 is an equidigital number, since it uses as much as digits as its factorization.

157685641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899910.

The product of its digits is 201600, while the sum is 43.

The square root of 157685641 is about 12557.2943343700. The cubic root of 157685641 is about 540.2532431296.

The spelling of 157685641 in words is "one hundred fifty-seven million, six hundred eighty-five thousand, six hundred forty-one".