66540602534 has 16 divisors (see below), whose sum is σ = 114093400608. Its totient is φ = 28511452032.

The previous prime is 66540602509. The next prime is 66540602537. The reversal of 66540602534 is 43520604566.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66540602491 and 66540602500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66540602537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425909 + ... + 560784.

It is an arithmetic number, because the mean of its divisors is an integer number (7130837538).

Almost surely, 2^66540602534 is an apocalyptic number.

66540602534 is a deficient number, since it is larger than the sum of its proper divisors (47552798074).

66540602534 is a wasteful number, since it uses less digits than its factorization.

66540602534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991519.

The product of its (nonzero) digits is 518400, while the sum is 41.

The spelling of 66540602534 in words is "sixty-six billion, five hundred forty million, six hundred two thousand, five hundred thirty-four".