66851672 has 16 divisors (see below), whose sum is σ = 128014560. Its totient is φ = 32714464.

The previous prime is 66851663. The next prime is 66851677. The reversal of 66851672 is 27615866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66851677) 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, 88523 + ... + 89274.

It is an arithmetic number, because the mean of its divisors is an integer number (8000910).

Almost surely, 2^66851672 is an apocalyptic number.

It is an amenable number.

66851672 is a deficient number, since it is larger than the sum of its proper divisors (61162888).

66851672 is a wasteful number, since it uses less digits than its factorization.

66851672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177850 (or 177846 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 66851672 is about 8176.2871769526. The cubic root of 66851672 is about 405.8548665491.

The spelling of 66851672 in words is "sixty-six million, eight hundred fifty-one thousand, six hundred seventy-two".