66654396 has 18 divisors (see below), whose sum is σ = 168487592. Its totient is φ = 22218120.

The previous prime is 66654377. The next prime is 66654403. The reversal of 66654396 is 69345666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×66654396² = 8885617012249632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 925720 + ... + 925791.

Almost surely, 2^66654396 is an apocalyptic number.

It is an amenable number.

66654396 is an abundant number, since it is smaller than the sum of its proper divisors (101833196).

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

66654396 is a wasteful number, since it uses less digits than its factorization.

66654396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851521 (or 1851516 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 66654396 is about 8164.2143528940. The cubic root of 66654396 is about 405.4552539540.

The spelling of 66654396 in words is "sixty-six million, six hundred fifty-four thousand, three hundred ninety-six".