66449779 has 16 divisors (see below), whose sum is σ = 73830240. Its totient is φ = 59304960.

The previous prime is 66449777. The next prime is 66449797. The reversal of 66449779 is 97794466.

It is not a de Polignac number, because 66449779 - 2¹ = 66449777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66449777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188067 + ... + 188419.

It is an arithmetic number, because the mean of its divisors is an integer number (4614390).

Almost surely, 2^66449779 is an apocalyptic number.

66449779 is a deficient number, since it is larger than the sum of its proper divisors (7380461).

66449779 is a wasteful number, since it uses less digits than its factorization.

66449779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630.

The product of its digits is 2286144, while the sum is 52.

The square root of 66449779 is about 8151.6733864894. The cubic root of 66449779 is about 405.0399371276.

The spelling of 66449779 in words is "sixty-six million, four hundred forty-nine thousand, seven hundred seventy-nine".