66019402 has 4 divisors (see below), whose sum is σ = 99029106. Its totient is φ = 33009700.

The previous prime is 66019351. The next prime is 66019403. The reversal of 66019402 is 20491066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20491066 = 2 ⋅10245533.

It can be written as a sum of positive squares in only one way, i.e., 52113961 + 13905441 = 7219^2 + 3729^2 .

It is a super-2 number, since 2×66019402² = 8717122880875208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66019403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16504849 + ... + 16504852.

Almost surely, 2^66019402 is an apocalyptic number.

66019402 is a deficient number, since it is larger than the sum of its proper divisors (33009704).

66019402 is a wasteful number, since it uses less digits than its factorization.

66019402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33009703.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 66019402 is about 8125.2324274448. The cubic root of 66019402 is about 404.1635982526.

The spelling of 66019402 in words is "sixty-six million, nineteen thousand, four hundred two".