66639454515 has 80 divisors (see below), whose sum is σ = 120152628288. Its totient is φ = 35334952704.

The previous prime is 66639454493. The next prime is 66639454523. The reversal of 66639454515 is 51545493666.

It is not a de Polignac number, because 66639454515 - 2¹³ = 66639446323 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 75985257 + ... + 75986133.

Almost surely, 2^66639454515 is an apocalyptic number.

66639454515 is a deficient number, since it is larger than the sum of its proper divisors (53513173773).

66639454515 is a wasteful number, since it uses less digits than its factorization.

66639454515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770 (or 1761 counting only the distinct ones).

The product of its digits is 11664000, while the sum is 54.

The spelling of 66639454515 in words is "sixty-six billion, six hundred thirty-nine million, four hundred fifty-four thousand, five hundred fifteen".