66677849 has 16 divisors (see below), whose sum is σ = 78395520. Its totient is φ = 55520640.

The previous prime is 66677839. The next prime is 66677861. The reversal of 66677849 is 94877666.

It is a happy number.

It is not a de Polignac number, because 66677849 - 2¹⁶ = 66612313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66677849.

It is not an unprimeable number, because it can be changed into a prime (66677839) 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, 108467 + ... + 109079.

It is an arithmetic number, because the mean of its divisors is an integer number (4899720).

Almost surely, 2^66677849 is an apocalyptic number.

It is an amenable number.

66677849 is a deficient number, since it is larger than the sum of its proper divisors (11717671).

66677849 is a wasteful number, since it uses less digits than its factorization.

66677849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040.

The product of its digits is 3048192, while the sum is 53.

The square root of 66677849 is about 8165.6505558345. The cubic root of 66677849 is about 405.5028028408.

The spelling of 66677849 in words is "sixty-six million, six hundred seventy-seven thousand, eight hundred forty-nine".