66970923 has 4 divisors (see below), whose sum is σ = 89294568. Its totient is φ = 44647280.

The previous prime is 66970921. The next prime is 66970949. The reversal of 66970923 is 32907966.

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 66970923 - 2¹ = 66970921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66970921) 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, 11161818 + ... + 11161823.

It is an arithmetic number, because the mean of its divisors is an integer number (22323642).

Almost surely, 2^66970923 is an apocalyptic number.

66970923 is a deficient number, since it is larger than the sum of its proper divisors (22323645).

66970923 is a wasteful number, since it uses less digits than its factorization.

66970923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22323644.

The product of its (nonzero) digits is 122472, while the sum is 42.

The square root of 66970923 is about 8183.5764186571. The cubic root of 66970923 is about 406.0960465011.

The spelling of 66970923 in words is "sixty-six million, nine hundred seventy thousand, nine hundred twenty-three".