66311619 has 16 divisors (see below), whose sum is σ = 97075200. Its totient is φ = 39929760.

The previous prime is 66311591. The next prime is 66311621. The reversal of 66311619 is 91611366.

It is not a de Polignac number, because 66311619 - 2⁵ = 66311587 is a prime.

It is a super-2 number, since 2×66311619² = 8794461628802322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 66311619.

It is not an unprimeable number, because it can be changed into a prime (66310619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1219 + ... + 11580.

It is an arithmetic number, because the mean of its divisors is an integer number (6067200).

Almost surely, 2^66311619 is an apocalyptic number.

66311619 is a deficient number, since it is larger than the sum of its proper divisors (30763581).

66311619 is a wasteful number, since it uses less digits than its factorization.

66311619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12970.

The product of its digits is 5832, while the sum is 33.

The square root of 66311619 is about 8143.1946433817. The cubic root of 66311619 is about 404.7590275094.

The spelling of 66311619 in words is "sixty-six million, three hundred eleven thousand, six hundred nineteen".