66700551 has 12 divisors (see below), whose sum is σ = 92109992. Its totient is φ = 42932064.

The previous prime is 66700549. The next prime is 66700559. The reversal of 66700551 is 15500766.

It is not a de Polignac number, because 66700551 - 2¹ = 66700549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66700559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10696 + ... + 15741.

Almost surely, 2^66700551 is an apocalyptic number.

66700551 is a deficient number, since it is larger than the sum of its proper divisors (25409441).

66700551 is a wasteful number, since it uses less digits than its factorization.

66700551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26498 (or 26469 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 66700551 is about 8167.0405288574. The cubic root of 66700551 is about 405.5488185227.

The spelling of 66700551 in words is "sixty-six million, seven hundred thousand, five hundred fifty-one".