49999999966 has 16 divisors (see below), whose sum is σ = 89440994304. Its totient is φ = 20496894264.

The previous prime is 49999999961. The next prime is 49999999967. The reversal of 49999999966 is 66999999994.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49999999961) 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, 77639430 + ... + 77640073.

It is an arithmetic number, because the mean of its divisors is an integer number (5590062144).

Almost surely, 2^49999999966 is an apocalyptic number.

49999999966 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

49999999966 is a deficient number, since it is larger than the sum of its proper divisors (39440994338).

49999999966 is a wasteful number, since it uses less digits than its factorization.

49999999966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155279535.

The product of its digits is 6198727824, while the sum is 88.

The spelling of 49999999966 in words is "forty-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred sixty-six".