66263949 has 12 divisors (see below), whose sum is σ = 95877756. Its totient is φ = 44100672.

The previous prime is 66263947. The next prime is 66263959. The reversal of 66263949 is 94936266.

66263949 is a `hidden beast` number, since 6 + 6 + 2 + 639 + 4 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 25431849 + 40832100 = 5043^2 + 6390^2 .

It is not a de Polignac number, because 66263949 - 2¹ = 66263947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66263947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 414 + ... + 11519.

It is an arithmetic number, because the mean of its divisors is an integer number (7989813).

Almost surely, 2^66263949 is an apocalyptic number.

It is an amenable number.

66263949 is a deficient number, since it is larger than the sum of its proper divisors (29613807).

66263949 is a wasteful number, since it uses less digits than its factorization.

66263949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12556 (or 12553 counting only the distinct ones).

The product of its digits is 419904, while the sum is 45.

The square root of 66263949 is about 8140.2671332088. The cubic root of 66263949 is about 404.6620133987.

The spelling of 66263949 in words is "sixty-six million, two hundred sixty-three thousand, nine hundred forty-nine".