66994797 has 8 divisors (see below), whose sum is σ = 89820640. Its totient is φ = 44416080.

The previous prime is 66994789. The next prime is 66994799. The reversal of 66994797 is 79749966.

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

It is not a de Polignac number, because 66994797 - 2³ = 66994789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66994799) 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, 61147 + ... + 62232.

It is an arithmetic number, because the mean of its divisors is an integer number (11227580).

Almost surely, 2^66994797 is an apocalyptic number.

It is an amenable number.

66994797 is a deficient number, since it is larger than the sum of its proper divisors (22825843).

66994797 is a wasteful number, since it uses less digits than its factorization.

66994797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123563.

The product of its digits is 5143824, while the sum is 57.

The square root of 66994797 is about 8185.0349418924. The cubic root of 66994797 is about 406.1442962228.

The spelling of 66994797 in words is "sixty-six million, nine hundred ninety-four thousand, seven hundred ninety-seven".