66850451 has 4 divisors (see below), whose sum is σ = 67130400. Its totient is φ = 66570504.

The previous prime is 66850447. The next prime is 66850457. The reversal of 66850451 is 15405866.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66850451 - 2² = 66850447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66850457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139616 + ... + 140093.

It is an arithmetic number, because the mean of its divisors is an integer number (16782600).

Almost surely, 2^66850451 is an apocalyptic number.

66850451 is a deficient number, since it is larger than the sum of its proper divisors (279949).

66850451 is a wasteful number, since it uses less digits than its factorization.

66850451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279948.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 66850451 is about 8176.2125094692. The cubic root of 66850451 is about 405.8523956470.

The spelling of 66850451 in words is "sixty-six million, eight hundred fifty thousand, four hundred fifty-one".