66750651 has 12 divisors (see below), whose sum is σ = 105183000. Its totient is φ = 40454880.

The previous prime is 66750637. The next prime is 66750661. The reversal of 66750651 is 15605766.

It is a happy number.

It is not a de Polignac number, because 66750651 - 2⁶ = 66750587 is a prime.

It is a super-3 number, since 3×66750651³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66750611) 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, 337026 + ... + 337223.

It is an arithmetic number, because the mean of its divisors is an integer number (8765250).

Almost surely, 2^66750651 is an apocalyptic number.

66750651 is a deficient number, since it is larger than the sum of its proper divisors (38432349).

66750651 is a wasteful number, since it uses less digits than its factorization.

66750651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674266 (or 674263 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 66750651 is about 8170.1071596400. The cubic root of 66750651 is about 405.6503314815.

The spelling of 66750651 in words is "sixty-six million, seven hundred fifty thousand, six hundred fifty-one".