155327857 has 4 divisors (see below), whose sum is σ = 160684020. Its totient is φ = 149971696.

The previous prime is 155327833. The next prime is 155327891. The reversal of 155327857 is 758723551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 758723551 = 61 ⋅12438091.

It can be written as a sum of positive squares in 2 ways, for example, as 72863296 + 82464561 = 8536^2 + 9081^2 .

It is a cyclic number.

It is not a de Polignac number, because 155327857 - 2²⁷ = 21110129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155327807) 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, 2678038 + ... + 2678095.

It is an arithmetic number, because the mean of its divisors is an integer number (40171005).

Almost surely, 2^155327857 is an apocalyptic number.

It is an amenable number.

155327857 is a deficient number, since it is larger than the sum of its proper divisors (5356163).

155327857 is an equidigital number, since it uses as much as digits as its factorization.

155327857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5356162.

The product of its digits is 294000, while the sum is 43.

The square root of 155327857 is about 12463.0596965593. The cubic root of 155327857 is about 537.5470095535.

The spelling of 155327857 in words is "one hundred fifty-five million, three hundred twenty-seven thousand, eight hundred fifty-seven".