66674620143640 has 32 divisors (see below), whose sum is σ = 153506683590480. Its totient is φ = 26049619032192.

The previous prime is 66674620143479. The next prime is 66674620143653. The reversal of 66674620143640 is 4634102647666.

It is a happy number.

It is a super-3 number, since 3×66674620143640³ (a number of 42 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19382155299 + ... + 19382158738.

Almost surely, 2^{66674620143640} is an apocalyptic number.

It is an amenable number.

66674620143640 is an abundant number, since it is smaller than the sum of its proper divisors (86832063446840).

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

66674620143640 is a wasteful number, since it uses less digits than its factorization.

66674620143640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38764314091 (or 38764314087 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 55.

The spelling of 66674620143640 in words is "sixty-six trillion, six hundred seventy-four billion, six hundred twenty million, one hundred forty-three thousand, six hundred forty".