66956799 has 32 divisors (see below), whose sum is σ = 111767040. Its totient is φ = 34710912.

The previous prime is 66956797. The next prime is 66956801. The reversal of 66956799 is 99765966.

It is an interprime number because it is at equal distance from previous prime (66956797) and next prime (66956801).

It is not a de Polignac number, because 66956799 - 2¹ = 66956797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66956797) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14029 + ... + 18185.

It is an arithmetic number, because the mean of its divisors is an integer number (3492720).

Almost surely, 2^66956799 is an apocalyptic number.

66956799 is a deficient number, since it is larger than the sum of its proper divisors (44810241).

66956799 is a wasteful number, since it uses less digits than its factorization.

66956799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4239.

The product of its digits is 5511240, while the sum is 57.

The square root of 66956799 is about 8182.7134252643. The cubic root of 66956799 is about 406.0674962807.

The spelling of 66956799 in words is "sixty-six million, nine hundred fifty-six thousand, seven hundred ninety-nine".