66021249 has 32 divisors (see below), whose sum is σ = 102795264. Its totient is φ = 36915840.

The previous prime is 66021239. The next prime is 66021253. The reversal of 66021249 is 94212066.

It is not a de Polignac number, because 66021249 - 2⁸ = 66020993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66021239) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 283237 + ... + 283469.

It is an arithmetic number, because the mean of its divisors is an integer number (3212352).

Almost surely, 2^66021249 is an apocalyptic number.

It is an amenable number.

66021249 is a deficient number, since it is larger than the sum of its proper divisors (36774015).

66021249 is a wasteful number, since it uses less digits than its factorization.

66021249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 66021249 is about 8125.3460849369. The cubic root of 66021249 is about 404.1673672618.

The spelling of 66021249 in words is "sixty-six million, twenty-one thousand, two hundred forty-nine".