1516816857 has 32 divisors (see below), whose sum is σ = 2238458112. Its totient is φ = 908734464.

The previous prime is 1516816837. The next prime is 1516816883. The reversal of 1516816857 is 7586186151.

It is a happy number.

It is not a de Polignac number, because 1516816857 - 2⁷ = 1516816729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1516816817) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1168833 + ... + 1170129.

It is an arithmetic number, because the mean of its divisors is an integer number (69951816).

Almost surely, 2^1516816857 is an apocalyptic number.

1516816857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1516816857 is a deficient number, since it is larger than the sum of its proper divisors (721641255).

1516816857 is a wasteful number, since it uses less digits than its factorization.

1516816857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2337.

The product of its digits is 403200, while the sum is 48.

The square root of 1516816857 is about 38946.3330366288. Note that the first 3 decimals coincide. The cubic root of 1516816857 is about 1148.9762425203.

The spelling of 1516816857 in words is "one billion, five hundred sixteen million, eight hundred sixteen thousand, eight hundred fifty-seven".