66893971 has 8 divisors (see below), whose sum is σ = 67598784. Its totient is φ = 66192360.

The previous prime is 66893969. The next prime is 66893987. The reversal of 66893971 is 17939866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66893971 - 2¹ = 66893969 is a prime.

It is a super-2 number, since 2×66893971² = 8949606712297682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66893921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73300 + ... + 74206.

It is an arithmetic number, because the mean of its divisors is an integer number (8449848).

Almost surely, 2^66893971 is an apocalyptic number.

66893971 is a deficient number, since it is larger than the sum of its proper divisors (704813).

66893971 is a wasteful number, since it uses less digits than its factorization.

66893971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601.

The product of its digits is 489888, while the sum is 49.

The square root of 66893971 is about 8178.8734554338. The cubic root of 66893971 is about 405.9404472335.

The spelling of 66893971 in words is "sixty-six million, eight hundred ninety-three thousand, nine hundred seventy-one".