816157857 has 16 divisors (see below), whose sum is σ = 1118499840. Its totient is φ = 529161600.

The previous prime is 816157831. The next prime is 816157861. The reversal of 816157857 is 758751618.

It is not a de Polignac number, because 816157857 - 2¹² = 816153761 is a prime.

It is a super-2 number, since 2×816157857² = 1332227295085664898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (816157807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8769 + ... + 41342.

It is an arithmetic number, because the mean of its divisors is an integer number (69906240).

Almost surely, 2^816157857 is an apocalyptic number.

It is an amenable number.

816157857 is a deficient number, since it is larger than the sum of its proper divisors (302341983).

816157857 is a wasteful number, since it uses less digits than its factorization.

816157857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50264.

The product of its digits is 470400, while the sum is 48.

The square root of 816157857 is about 28568.4766307201. The cubic root of 816157857 is about 934.5259999391.

The spelling of 816157857 in words is "eight hundred sixteen million, one hundred fifty-seven thousand, eight hundred fifty-seven".