66851697 has 16 divisors (see below), whose sum is σ = 97440192. Its totient is φ = 40432320.

The previous prime is 66851693. The next prime is 66851723. The reversal of 66851697 is 79615866.

It is not a de Polignac number, because 66851697 - 2² = 66851693 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66851693) 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, 16563 + ... + 20199.

It is an arithmetic number, because the mean of its divisors is an integer number (6090012).

Almost surely, 2^66851697 is an apocalyptic number.

It is an amenable number.

66851697 is a deficient number, since it is larger than the sum of its proper divisors (30588495).

66851697 is a wasteful number, since it uses less digits than its factorization.

66851697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4208.

The product of its digits is 544320, while the sum is 48.

The square root of 66851697 is about 8176.2887057638. The cubic root of 66851697 is about 405.8549171405.

The spelling of 66851697 in words is "sixty-six million, eight hundred fifty-one thousand, six hundred ninety-seven".