66764744464770 has 128 divisors (see below), whose sum is σ = 194242906656000. Its totient is φ = 16183876308480.

The previous prime is 66764744464751. The next prime is 66764744464793. The reversal of 66764744464770 is 7746444746766.

66764744464770 is a `hidden beast` number, since 6 + 6 + 7 + 6 + 4 + 74 + 446 + 47 + 70 = 666.

It is a super-2 number, since 2×66764744464770² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30817516 + ... + 32912744.

It is an arithmetic number, because the mean of its divisors is an integer number (1517522708250).

Almost surely, 2^{66764744464770} is an apocalyptic number.

66764744464770 is an abundant number, since it is smaller than the sum of its proper divisors (127478162191230).

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

66764744464770 is a wasteful number, since it uses less digits than its factorization.

66764744464770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105985 (or 2105979 counting only the distinct ones).

The product of its (nonzero) digits is 3186376704, while the sum is 72.

The spelling of 66764744464770 in words is "sixty-six trillion, seven hundred sixty-four billion, seven hundred forty-four million, four hundred sixty-four thousand, seven hundred seventy".