66354397 has 8 divisors (see below), whose sum is σ = 67587192. Its totient is φ = 65126400.

The previous prime is 66354377. The next prime is 66354413. The reversal of 66354397 is 79345366.

It can be written as a sum of positive squares in 4 ways, for example, as 22410756 + 43943641 = 4734^2 + 6629^2 .

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 66354397 - 2⁷ = 66354269 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 (66354347) 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, 38253 + ... + 39949.

It is an arithmetic number, because the mean of its divisors is an integer number (8448399).

Almost surely, 2^66354397 is an apocalyptic number.

It is an amenable number.

66354397 is a deficient number, since it is larger than the sum of its proper divisors (1232795).

66354397 is a wasteful number, since it uses less digits than its factorization.

66354397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399.

The product of its digits is 408240, while the sum is 43.

The square root of 66354397 is about 8145.8208303399. The cubic root of 66354397 is about 404.8460462450.

The spelling of 66354397 in words is "sixty-six million, three hundred fifty-four thousand, three hundred ninety-seven".