66416670 has 48 divisors (see below), whose sum is σ = 178644960. Its totient is φ = 17099712.

The previous prime is 66416659. The next prime is 66416677. The reversal of 66416670 is 7661466.

66416670 is a `hidden beast` number, since 6 + 641 + 6 + 6 + 7 + 0 = 666.

It is a super-2 number, since 2×66416670² = 8822348107777800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66416677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10114 + ... + 15333.

It is an arithmetic number, because the mean of its divisors is an integer number (3721770).

Almost surely, 2^66416670 is an apocalyptic number.

66416670 is an abundant number, since it is smaller than the sum of its proper divisors (112228290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66416670 is a wasteful number, since it uses less digits than its factorization.

66416670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25489 (or 25486 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 66416670 is about 8149.6423234397. The cubic root of 66416670 is about 404.9726547609.

The spelling of 66416670 in words is "sixty-six million, four hundred sixteen thousand, six hundred seventy".