3666643257 has 16 divisors (see below), whose sum is σ = 4922265600. Its totient is φ = 2427769872.

The previous prime is 3666643241. The next prime is 3666643259. The reversal of 3666643257 is 7523466663.

3666643257 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3666643257 - 2⁴ = 3666643241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3666643259) 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, 345208 + ... + 355670.

It is an arithmetic number, because the mean of its divisors is an integer number (307641600).

Almost surely, 2^3666643257 is an apocalyptic number.

It is an amenable number.

3666643257 is a deficient number, since it is larger than the sum of its proper divisors (1255622343).

3666643257 is a wasteful number, since it uses less digits than its factorization.

3666643257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11252.

The product of its digits is 3265920, while the sum is 48.

The square root of 3666643257 is about 60552.8137826807. The cubic root of 3666643257 is about 1542.0183880648.

The spelling of 3666643257 in words is "three billion, six hundred sixty-six million, six hundred forty-three thousand, two hundred fifty-seven".