66786401 has 8 divisors (see below), whose sum is σ = 73677600. Its totient is φ = 60031840.

The previous prime is 66786359. The next prime is 66786403. The reversal of 66786401 is 10468766.

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

It is a de Polignac number, because none of the positive numbers 2^k-66786401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66786403) 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, 33131 + ... + 35088.

It is an arithmetic number, because the mean of its divisors is an integer number (9209700).

Almost surely, 2^66786401 is an apocalyptic number.

It is an amenable number.

66786401 is a deficient number, since it is larger than the sum of its proper divisors (6891199).

66786401 is a wasteful number, since it uses less digits than its factorization.

66786401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68319.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 66786401 is about 8172.2947205788. The cubic root of 66786401 is about 405.7227373229.

The spelling of 66786401 in words is "sixty-six million, seven hundred eighty-six thousand, four hundred one".