66967551 has 12 divisors (see below), whose sum is σ = 110549712. Its totient is φ = 38267136.

The previous prime is 66967547. The next prime is 66967577. The reversal of 66967551 is 15576966.

66967551 is a `hidden beast` number, since 6 + 6 + 96 + 7 + 551 = 666.

It is not a de Polignac number, because 66967551 - 2² = 66967547 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66967497 and 66967506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66967541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 531426 + ... + 531551.

It is an arithmetic number, because the mean of its divisors is an integer number (9212476).

Almost surely, 2^66967551 is an apocalyptic number.

66967551 is a deficient number, since it is larger than the sum of its proper divisors (43582161).

66967551 is a wasteful number, since it uses less digits than its factorization.

66967551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062990 (or 1062987 counting only the distinct ones).

The product of its digits is 340200, while the sum is 45.

The square root of 66967551 is about 8183.3703936703. The cubic root of 66967551 is about 406.0892307130.

The spelling of 66967551 in words is "sixty-six million, nine hundred sixty-seven thousand, five hundred fifty-one".