66019650 has 24 divisors (see below), whose sum is σ = 163729104. Its totient is φ = 17605200.

The previous prime is 66019649. The next prime is 66019651. The reversal of 66019650 is 5691066.

It is an interprime number because it is at equal distance from previous prime (66019649) and next prime (66019651).

It is a super-2 number, since 2×66019650² = 8717188372245000, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66019651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 219916 + ... + 220215.

It is an arithmetic number, because the mean of its divisors is an integer number (6822046).

Almost surely, 2^66019650 is an apocalyptic number.

66019650 is an abundant number, since it is smaller than the sum of its proper divisors (97709454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66019650 is a wasteful number, since it uses less digits than its factorization.

66019650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440146 (or 440141 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 66019650 is about 8125.2476885323. The cubic root of 66019650 is about 404.1641043283.

The spelling of 66019650 in words is "sixty-six million, nineteen thousand, six hundred fifty".