66904851 has 16 divisors (see below), whose sum is σ = 99169280. Its totient is φ = 39843360.

The previous prime is 66904847. The next prime is 66904883. The reversal of 66904851 is 15840966.

It is not a de Polignac number, because 66904851 - 2² = 66904847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66904841) 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, 26461 + ... + 28878.

It is an arithmetic number, because the mean of its divisors is an integer number (6198080).

Almost surely, 2^66904851 is an apocalyptic number.

66904851 is a deficient number, since it is larger than the sum of its proper divisors (32264429).

66904851 is a wasteful number, since it uses less digits than its factorization.

66904851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55386.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 66904851 is about 8179.5385566669. The cubic root of 66904851 is about 405.9624541626.

The spelling of 66904851 in words is "sixty-six million, nine hundred four thousand, eight hundred fifty-one".