66025619 has 16 divisors (see below), whose sum is σ = 73910016. Its totient is φ = 58476000.

The previous prime is 66025591. The next prime is 66025657. The reversal of 66025619 is 91652066.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-66025619 is a prime.

It is a super-2 number, since 2×66025619² = 8718764728666322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66025679) 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, 73994 + ... + 74880.

It is an arithmetic number, because the mean of its divisors is an integer number (4619376).

Almost surely, 2^66025619 is an apocalyptic number.

66025619 is a deficient number, since it is larger than the sum of its proper divisors (7884397).

66025619 is a wasteful number, since it uses less digits than its factorization.

66025619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 66025619 is about 8125.6149921098. The cubic root of 66025619 is about 404.1762844536.

It can be divided in two parts, 6602 and 5619, that added together give a palindrome (12221).

The spelling of 66025619 in words is "sixty-six million, twenty-five thousand, six hundred nineteen".