66425747715787 has 16 divisors (see below), whose sum is σ = 66949240286880. Its totient is φ = 65904472972800.

The previous prime is 66425747715773. The next prime is 66425747715791. The reversal of 66425747715787 is 78751774752466.

It is a cyclic number.

It is not a de Polignac number, because 66425747715787 - 2⁷ = 66425747715659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66425747715727) 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, 111989337 + ... + 112580917.

It is an arithmetic number, because the mean of its divisors is an integer number (4184327517930).

Almost surely, 2^{66425747715787} is an apocalyptic number.

66425747715787 is a deficient number, since it is larger than the sum of its proper divisors (523492571093).

66425747715787 is a wasteful number, since it uses less digits than its factorization.

66425747715787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593454.

The product of its digits is 3872332800, while the sum is 76.

The spelling of 66425747715787 in words is "sixty-six trillion, four hundred twenty-five billion, seven hundred forty-seven million, seven hundred fifteen thousand, seven hundred eighty-seven".