66071646 has 16 divisors (see below), whose sum is σ = 146826000. Its totient is φ = 22023864.

The previous prime is 66071611. The next prime is 66071651. The reversal of 66071646 is 64617066.

66071646 is a `hidden beast` number, since 6 + 6 + 0 + 7 + 1 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 66071646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611721 + ... + 611828.

It is an arithmetic number, because the mean of its divisors is an integer number (9176625).

Almost surely, 2^66071646 is an apocalyptic number.

66071646 is an abundant number, since it is smaller than the sum of its proper divisors (80754354).

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

66071646 is a wasteful number, since it uses less digits than its factorization.

66071646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223560 (or 1223554 counting only the distinct ones).

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

The square root of 66071646 is about 8128.4467150865. The cubic root of 66071646 is about 404.2701808382.

The spelling of 66071646 in words is "sixty-six million, seventy-one thousand, six hundred forty-six".