66661602 has 32 divisors (see below), whose sum is σ = 152917632. Its totient is φ = 18977664.

The previous prime is 66661591. The next prime is 66661619. The reversal of 66661602 is 20616666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9598 + ... + 15014.

It is an arithmetic number, because the mean of its divisors is an integer number (4778676).

Almost surely, 2^66661602 is an apocalyptic number.

66661602 is an abundant number, since it is smaller than the sum of its proper divisors (86256030).

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

66661602 is a wasteful number, since it uses less digits than its factorization.

66661602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5722.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 66661602 is about 8164.6556571603. The cubic root of 66661602 is about 405.4698646696.

The spelling of 66661602 in words is "sixty-six million, six hundred sixty-one thousand, six hundred two".