16557957 has 24 divisors (see below), whose sum is σ = 25969944. Its totient is φ = 10105344.

The previous prime is 16557943. The next prime is 16557977. The reversal of 16557957 is 75975561.

It is a happy number.

16557957 is a `hidden beast` number, since 1 + 6 + 557 + 95 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4384836 + 12173121 = 2094^2 + 3489^2 .

It is not a de Polignac number, because 16557957 - 2¹⁰ = 16556933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16557917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15513 + ... + 16545.

It is an arithmetic number, because the mean of its divisors is an integer number (1082081).

Almost surely, 2^16557957 is an apocalyptic number.

It is an amenable number.

16557957 is a deficient number, since it is larger than the sum of its proper divisors (9411987).

16557957 is a wasteful number, since it uses less digits than its factorization.

16557957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189 (or 1186 counting only the distinct ones).

The product of its digits is 330750, while the sum is 45.

The square root of 16557957 is about 4069.1469622023. The cubic root of 16557957 is about 254.8798973055.

The spelling of 16557957 in words is "sixteen million, five hundred fifty-seven thousand, nine hundred fifty-seven".