66538747430 has 16 divisors (see below), whose sum is σ = 119773078704. Its totient is φ = 26614758240.

The previous prime is 66538747421. The next prime is 66538747481. The reversal of 66538747430 is 3474783566.

It is a super-3 number, since 3×66538747430³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419609 + ... + 556011.

It is an arithmetic number, because the mean of its divisors is an integer number (7485817419).

Almost surely, 2^66538747430 is an apocalyptic number.

66538747430 is a deficient number, since it is larger than the sum of its proper divisors (53234331274).

66538747430 is a wasteful number, since it uses less digits than its factorization.

66538747430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185191.

The product of its (nonzero) digits is 10160640, while the sum is 53.

The spelling of 66538747430 in words is "sixty-six billion, five hundred thirty-eight million, seven hundred forty-seven thousand, four hundred thirty".