66888706 has 4 divisors (see below), whose sum is σ = 100333062. Its totient is φ = 33444352.

The previous prime is 66888697. The next prime is 66888707. The reversal of 66888706 is 60788866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 66830625 + 58081 = 8175^2 + 241^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66888706.

It is not an unprimeable number, because it can be changed into a prime (66888707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16722175 + ... + 16722178.

Almost surely, 2^66888706 is an apocalyptic number.

66888706 is a deficient number, since it is larger than the sum of its proper divisors (33444356).

66888706 is a wasteful number, since it uses less digits than its factorization.

66888706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33444355.

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 66888706 is about 8178.5515832573. The cubic root of 66888706 is about 405.9297968839.

The spelling of 66888706 in words is "sixty-six million, eight hundred eighty-eight thousand, seven hundred six".