4156993818 has 32 divisors (see below), whose sum is σ = 9291182400. Its totient is φ = 1377651888.

The previous prime is 4156993807. The next prime is 4156993823. The reversal of 4156993818 is 8183996514.

4156993818 is a `hidden beast` number, since 41 + 569 + 9 + 38 + 1 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213148 + ... + 231831.

It is an arithmetic number, because the mean of its divisors is an integer number (290349450).

Almost surely, 2^4156993818 is an apocalyptic number.

4156993818 is an abundant number, since it is smaller than the sum of its proper divisors (5134188582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4156993818 is a wasteful number, since it uses less digits than its factorization.

4156993818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445163 (or 445157 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 4156993818 is about 64474.7533380315. The cubic root of 4156993818 is about 1607.9028051633.

The spelling of 4156993818 in words is "four billion, one hundred fifty-six million, nine hundred ninety-three thousand, eight hundred eighteen".