66966968 has 8 divisors (see below), whose sum is σ = 125563080. Its totient is φ = 33483480.

The previous prime is 66966967. The next prime is 66966983. The reversal of 66966968 is 86966966.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×66966968² = 8969149606226048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66966967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4185428 + ... + 4185443.

It is an arithmetic number, because the mean of its divisors is an integer number (15695385).

Almost surely, 2^66966968 is an apocalyptic number.

It is an amenable number.

66966968 is a deficient number, since it is larger than the sum of its proper divisors (58596112).

66966968 is a wasteful number, since it uses less digits than its factorization.

66966968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8370877 (or 8370873 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 56.

The square root of 66966968 is about 8183.3347725729. The cubic root of 66966968 is about 406.0880522781.

The spelling of 66966968 in words is "sixty-six million, nine hundred sixty-six thousand, nine hundred sixty-eight".