66009688475 has 12 divisors (see below), whose sum is σ = 81932846736. Its totient is φ = 52755600480.

The previous prime is 66009688469. The next prime is 66009688487. The reversal of 66009688475 is 57488690066.

It is not a de Polignac number, because 66009688475 - 2²⁶ = 65942579611 is a prime.

It is a super-3 number, since 3×66009688475³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1277927 + ... + 1328576.

It is an arithmetic number, because the mean of its divisors is an integer number (6827737228).

Almost surely, 2^66009688475 is an apocalyptic number.

66009688475 is a deficient number, since it is larger than the sum of its proper divisors (15923158261).

66009688475 is a wasteful number, since it uses less digits than its factorization.

66009688475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2607526 (or 2607521 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 59.

The spelling of 66009688475 in words is "sixty-six billion, nine million, six hundred eighty-eight thousand, four hundred seventy-five".