66879261 has 24 divisors (see below), whose sum is σ = 99240960. Its totient is φ = 43380576.

The previous prime is 66879257. The next prime is 66879283. The reversal of 66879261 is 16297866.

It is not a de Polignac number, because 66879261 - 2² = 66879257 is a prime.

It is a super-2 number, since 2×66879261² = 8945671103812242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66879251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93975 + ... + 94683.

It is an arithmetic number, because the mean of its divisors is an integer number (4135040).

Almost surely, 2^66879261 is an apocalyptic number.

It is an amenable number.

66879261 is a deficient number, since it is larger than the sum of its proper divisors (32361699).

66879261 is a wasteful number, since it uses less digits than its factorization.

66879261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985 (or 982 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 66879261 is about 8177.9741378901. The cubic root of 66879261 is about 405.9106895854.

The spelling of 66879261 in words is "sixty-six million, eight hundred seventy-nine thousand, two hundred sixty-one".