66553346412 has 84 divisors (see below), whose sum is σ = 199568806416. Its totient is φ = 19015236000.

The previous prime is 66553346407. The next prime is 66553346413. The reversal of 66553346412 is 21464335566.

66553346412 is a `hidden beast` number, since 6 + 6 + 553 + 34 + 64 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (84).

It is not an unprimeable number, because it can be changed into a prime (66553346413) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1609839 + ... + 1650662.

It is an arithmetic number, because the mean of its divisors is an integer number (2375819124).

Almost surely, 2^66553346412 is an apocalyptic number.

It is an amenable number.

66553346412 is an abundant number, since it is smaller than the sum of its proper divisors (133015460004).

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

66553346412 is a wasteful number, since it uses less digits than its factorization.

66553346412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3260530 (or 3260513 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 45.

The spelling of 66553346412 in words is "sixty-six billion, five hundred fifty-three million, three hundred forty-six thousand, four hundred twelve".