49991666 has 8 divisors (see below), whose sum is σ = 75760860. Its totient is φ = 24738048.

The previous prime is 49991653. The next prime is 49991681. The reversal of 49991666 is 66619994.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 49294441 + 697225 = 7021^2 + 835^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128651 + ... + 129038.

Almost surely, 2^49991666 is an apocalyptic number.

49991666 is a deficient number, since it is larger than the sum of its proper divisors (25769194).

49991666 is a wasteful number, since it uses less digits than its factorization.

49991666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257788.

The product of its digits is 629856, while the sum is 50.

The square root of 49991666 is about 7070.4784845157. The cubic root of 49991666 is about 368.3826802477.

The spelling of 49991666 in words is "forty-nine million, nine hundred ninety-one thousand, six hundred sixty-six".