66978045459 has 96 divisors (see below), whose sum is σ = 117566152704. Its totient is φ = 36315417600.

The previous prime is 66978045439. The next prime is 66978045469. The reversal of 66978045459 is 95454087966.

66978045459 is a `hidden beast` number, since 6 + 6 + 9 + 7 + 80 + 4 + 545 + 9 = 666.

It is not a de Polignac number, because 66978045459 - 2³⁵ = 32618307091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66978045396 and 66978045405.

It is not an unprimeable number, because it can be changed into a prime (66978045419) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2134534 + ... + 2165684.

It is an arithmetic number, because the mean of its divisors is an integer number (1224647424).

Almost surely, 2^66978045459 is an apocalyptic number.

66978045459 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

66978045459 is a deficient number, since it is larger than the sum of its proper divisors (50588107245).

66978045459 is a wasteful number, since it uses less digits than its factorization.

66978045459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31257 (or 31254 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 63.

The spelling of 66978045459 in words is "sixty-six billion, nine hundred seventy-eight million, forty-five thousand, four hundred fifty-nine".