69966721 has 16 divisors (see below), whose sum is σ = 82944000. Its totient is φ = 58309200.

The previous prime is 69966641. The next prime is 69966733. The reversal of 69966721 is 12766996.

It is a cyclic number.

It is not a de Polignac number, because 69966721 - 2²¹ = 67869569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69966751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1080 + ... + 11878.

It is an arithmetic number, because the mean of its divisors is an integer number (5184000).

Almost surely, 2^69966721 is an apocalyptic number.

It is an amenable number.

69966721 is a deficient number, since it is larger than the sum of its proper divisors (12977279).

69966721 is a wasteful number, since it uses less digits than its factorization.

69966721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10860.

The product of its digits is 244944, while the sum is 46.

The square root of 69966721 is about 8364.6112282640. The cubic root of 69966721 is about 412.0632090314.

The spelling of 69966721 in words is "sixty-nine million, nine hundred sixty-six thousand, seven hundred twenty-one".