51863666 has 16 divisors (see below), whose sum is σ = 81687744. Its totient is φ = 24648624.

The previous prime is 51863663. The next prime is 51863671. The reversal of 51863666 is 66636815.

It is not an unprimeable number, because it can be changed into a prime (51863663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4040 + ... + 10956.

It is an arithmetic number, because the mean of its divisors is an integer number (5105484).

Almost surely, 2^51863666 is an apocalyptic number.

51863666 is a deficient number, since it is larger than the sum of its proper divisors (29824078).

51863666 is a wasteful number, since it uses less digits than its factorization.

51863666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7105.

The product of its digits is 155520, while the sum is 41.

The square root of 51863666 is about 7201.6432846955. The cubic root of 51863666 is about 372.9246326413.

The spelling of 51863666 in words is "fifty-one million, eight hundred sixty-three thousand, six hundred sixty-six".