66564154765 has 8 divisors (see below), whose sum is σ = 79893693720. Its totient is φ = 53240185152.

The previous prime is 66564154673. The next prime is 66564154777. The reversal of 66564154765 is 56745146566.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3945598596 + 62618556169 = 62814^2 + 250237^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66564154765 - 2⁷ = 66564154637 is a prime.

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, 1365994 + ... + 1413883.

It is an arithmetic number, because the mean of its divisors is an integer number (9986711715).

Almost surely, 2^66564154765 is an apocalyptic number.

It is an amenable number.

66564154765 is a deficient number, since it is larger than the sum of its proper divisors (13329538955).

66564154765 is a wasteful number, since it uses less digits than its factorization.

66564154765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2784671.

The product of its digits is 18144000, while the sum is 55.

The spelling of 66564154765 in words is "sixty-six billion, five hundred sixty-four million, one hundred fifty-four thousand, seven hundred sixty-five".