66054391 has 8 divisors (see below), whose sum is σ = 71252384. Its totient is φ = 60873120.

The previous prime is 66054379. The next prime is 66054437. The reversal of 66054391 is 19345066.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66054391 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 (66054311) 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, 4750 + ... + 12436.

It is an arithmetic number, because the mean of its divisors is an integer number (8906548).

Almost surely, 2^66054391 is an apocalyptic number.

66054391 is a deficient number, since it is larger than the sum of its proper divisors (5197993).

66054391 is a wasteful number, since it uses less digits than its factorization.

66054391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8361.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 66054391 is about 8127.3852498820. The cubic root of 66054391 is about 404.2349852603.

The spelling of 66054391 in words is "sixty-six million, fifty-four thousand, three hundred ninety-one".