66351619 has 8 divisors (see below), whose sum is σ = 71108640. Its totient is φ = 61750656.

The previous prime is 66351569. The next prime is 66351683. The reversal of 66351619 is 91615366.

66351619 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66351619 - 2⁷ = 66351491 is a prime.

It is a super-2 number, since 2×66351619² = 8805074687842322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (66351689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38134 + ... + 39835.

It is an arithmetic number, because the mean of its divisors is an integer number (8888580).

Almost surely, 2^66351619 is an apocalyptic number.

66351619 is a deficient number, since it is larger than the sum of its proper divisors (4757021).

66351619 is a wasteful number, since it uses less digits than its factorization.

66351619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78029.

The product of its digits is 29160, while the sum is 37.

The square root of 66351619 is about 8145.6503116694. The cubic root of 66351619 is about 404.8403963908.

The spelling of 66351619 in words is "sixty-six million, three hundred fifty-one thousand, six hundred nineteen".