66432578757 has 16 divisors (see below), whose sum is σ = 88929155328. Its totient is φ = 44112288960.

The previous prime is 66432578743. The next prime is 66432578761. The reversal of 66432578757 is 75787523466.

It is a happy number.

It is not a de Polignac number, because 66432578757 - 2¹⁰ = 66432577733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66432578757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66432578777) 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, 3448083 + ... + 3467295.

It is an arithmetic number, because the mean of its divisors is an integer number (5558072208).

Almost surely, 2^66432578757 is an apocalyptic number.

It is an amenable number.

66432578757 is a deficient number, since it is larger than the sum of its proper divisors (22496576571).

66432578757 is a wasteful number, since it uses less digits than its factorization.

66432578757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23740.

The product of its digits is 59270400, while the sum is 60.

The spelling of 66432578757 in words is "sixty-six billion, four hundred thirty-two million, five hundred seventy-eight thousand, seven hundred fifty-seven".