66004251 has 8 divisors (see below), whose sum is σ = 93182544. Its totient is φ = 41414400.

The previous prime is 66004249. The next prime is 66004283. The reversal of 66004251 is 15240066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66004251 - 2¹ = 66004249 is a prime.

It is a super-2 number, since 2×66004251² = 8713122300142002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66004201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 647050 + ... + 647151.

It is an arithmetic number, because the mean of its divisors is an integer number (11647818).

Almost surely, 2^66004251 is an apocalyptic number.

66004251 is a deficient number, since it is larger than the sum of its proper divisors (27178293).

66004251 is a wasteful number, since it uses less digits than its factorization.

66004251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294221.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 66004251 is about 8124.3000313873. The cubic root of 66004251 is about 404.1326782958.

The spelling of 66004251 in words is "sixty-six million, four thousand, two hundred fifty-one".