66749799 has 8 divisors (see below), whose sum is σ = 90458992. Its totient is φ = 43770240.

The previous prime is 66749783. The next prime is 66749807. The reversal of 66749799 is 99794766.

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

It is not a de Polignac number, because 66749799 - 2⁴ = 66749783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66749759) 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, 182194 + ... + 182559.

It is an arithmetic number, because the mean of its divisors is an integer number (11307374).

Almost surely, 2^66749799 is an apocalyptic number.

66749799 is a deficient number, since it is larger than the sum of its proper divisors (23709193).

66749799 is a wasteful number, since it uses less digits than its factorization.

66749799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364817.

The product of its digits is 5143824, while the sum is 57.

The square root of 66749799 is about 8170.0550181746. The cubic root of 66749799 is about 405.6486055779.

The spelling of 66749799 in words is "sixty-six million, seven hundred forty-nine thousand, seven hundred ninety-nine".