66906404747472 has 80 divisors (see below), whose sum is σ = 176863965696000. Its totient is φ = 21783129680256.

The previous prime is 66906404747461. The next prime is 66906404747473. The reversal of 66906404747472 is 27474740460966.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66906404747473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148380823 + ... + 148831049.

It is an arithmetic number, because the mean of its divisors is an integer number (2210799571200).

Almost surely, 2^{66906404747472} is an apocalyptic number.

It is an amenable number.

66906404747472 is an abundant number, since it is smaller than the sum of its proper divisors (109957560948528).

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

66906404747472 is a wasteful number, since it uses less digits than its factorization.

66906404747472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522280 (or 522274 counting only the distinct ones).

The product of its (nonzero) digits is 341397504, while the sum is 66.

The spelling of 66906404747472 in words is "sixty-six trillion, nine hundred six billion, four hundred four million, seven hundred forty-seven thousand, four hundred seventy-two".