66351819 has 8 divisors (see below), whose sum is σ = 93125440. Its totient is φ = 41906376.

The previous prime is 66351787. The next prime is 66351821. The reversal of 66351819 is 91815366.

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

It is not a de Polignac number, because 66351819 - 2⁵ = 66351787 is a prime.

It is a super-2 number, since 2×66351819² = 8805127769217522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66351839) 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, 581977 + ... + 582090.

It is an arithmetic number, because the mean of its divisors is an integer number (11640680).

Almost surely, 2^66351819 is an apocalyptic number.

66351819 is a deficient number, since it is larger than the sum of its proper divisors (26773621).

66351819 is a wasteful number, since it uses less digits than its factorization.

66351819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164089.

The product of its digits is 38880, while the sum is 39.

The square root of 66351819 is about 8145.6625881508. The cubic root of 66351819 is about 404.8408031530.

The spelling of 66351819 in words is "sixty-six million, three hundred fifty-one thousand, eight hundred nineteen".