66687689425 has 24 divisors (see below), whose sum is σ = 94541566016. Its totient is φ = 45711483840.

The previous prime is 66687689407. The next prime is 66687689443. The reversal of 66687689425 is 52498678666.

It is an interprime number because it is at equal distance from previous prime (66687689407) and next prime (66687689443).

It is not a de Polignac number, because 66687689425 - 2¹³ = 66687681233 is a prime.

It is a Duffinian 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 23 ways as a sum of consecutive naturals, for example, 403339 + ... + 544111.

Almost surely, 2^66687689425 is an apocalyptic number.

It is an amenable number.

66687689425 is a deficient number, since it is larger than the sum of its proper divisors (27853876591).

66687689425 is a wasteful number, since it uses less digits than its factorization.

66687689425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143497 (or 143492 counting only the distinct ones).

The product of its digits is 209018880, while the sum is 67.

The spelling of 66687689425 in words is "sixty-six billion, six hundred eighty-seven million, six hundred eighty-nine thousand, four hundred twenty-five".