66869735 has 4 divisors (see below), whose sum is σ = 80243688. Its totient is φ = 53495784.

The previous prime is 66869723. The next prime is 66869741. The reversal of 66869735 is 53796866.

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 66869735 - 2¹² = 66865639 is a prime.

It is a super-2 number, since 2×66869735² = 8943122917940450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6686969 + ... + 6686978.

It is an arithmetic number, because the mean of its divisors is an integer number (20060922).

Almost surely, 2^66869735 is an apocalyptic number.

66869735 is a deficient number, since it is larger than the sum of its proper divisors (13373953).

66869735 is a wasteful number, since it uses less digits than its factorization.

66869735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13373952.

The product of its digits is 1632960, while the sum is 50.

The square root of 66869735 is about 8177.3916990688. The cubic root of 66869735 is about 405.8914166012.

The spelling of 66869735 in words is "sixty-six million, eight hundred sixty-nine thousand, seven hundred thirty-five".