66534021126315 has 48 divisors (see below), whose sum is σ = 115719960421728. Its totient is φ = 35363687428608.

The previous prime is 66534021126283. The next prime is 66534021126317. The reversal of 66534021126315 is 51362112043566.

It is a happy number.

66534021126315 is a `hidden beast` number, since 6 + 6 + 5 + 3 + 4 + 0 + 2 + 1 + 1 + 2 + 631 + 5 = 666.

It is not a de Polignac number, because 66534021126315 - 2⁵ = 66534021126283 is a prime.

It is a super-3 number, since 3×66534021126315³ (a number of 42 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (66534021126317) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13314004 + ... + 17616206.

It is an arithmetic number, because the mean of its divisors is an integer number (2410832508786).

Almost surely, 2^{66534021126315} is an apocalyptic number.

66534021126315 is a deficient number, since it is larger than the sum of its proper divisors (49185939295413).

66534021126315 is a wasteful number, since it uses less digits than its factorization.

66534021126315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4303388 (or 4303385 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 66534021126315 in words is "sixty-six trillion, five hundred thirty-four billion, twenty-one million, one hundred twenty-six thousand, three hundred fifteen".