66013255363401 has 6 divisors (see below), whose sum is σ = 95352479969370. Its totient is φ = 44008836908928.

The previous prime is 66013255363357. The next prime is 66013255363403. The reversal of 66013255363401 is 10436355231066.

66013255363401 is a `hidden beast` number, since 6 + 6 + 0 + 1 + 3 + 2 + 5 + 5 + 3 + 634 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 62353211924025 + 3660043439376 = 7896405^2 + 1913124^2 .

It is not a de Polignac number, because 66013255363401 - 2²³ = 66013246974793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66013255363403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3667403075736 + ... + 3667403075753.

It is an arithmetic number, because the mean of its divisors is an integer number (15892079994895).

Almost surely, 2^{66013255363401} is an apocalyptic number.

It is an amenable number.

66013255363401 is a deficient number, since it is larger than the sum of its proper divisors (29339224605969).

66013255363401 is a wasteful number, since it uses less digits than its factorization.

66013255363401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7334806151495 (or 7334806151492 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 45.

The spelling of 66013255363401 in words is "sixty-six trillion, thirteen billion, two hundred fifty-five million, three hundred sixty-three thousand, four hundred one".