66707763 has 4 divisors (see below), whose sum is σ = 88943688. Its totient is φ = 44471840.

The previous prime is 66707741. The next prime is 66707777. The reversal of 66707763 is 36770766.

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

It is a cyclic number.

It is not a de Polignac number, because 66707763 - 2¹² = 66703667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66727763) 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, 11117958 + ... + 11117963.

It is an arithmetic number, because the mean of its divisors is an integer number (22235922).

Almost surely, 2^66707763 is an apocalyptic number.

66707763 is a deficient number, since it is larger than the sum of its proper divisors (22235925).

66707763 is a wasteful number, since it uses less digits than its factorization.

66707763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22235924.

The product of its (nonzero) digits is 222264, while the sum is 42.

The square root of 66707763 is about 8167.4820477305. The cubic root of 66707763 is about 405.5634346572.

The spelling of 66707763 in words is "sixty-six million, seven hundred seven thousand, seven hundred sixty-three".