667047551 has 2 divisors, whose sum is σ = 667047552. Its totient is φ = 667047550.

The previous prime is 667047503. The next prime is 667047583. The reversal of 667047551 is 155740766.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667047551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 667047499 and 667047508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667047151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333523775 + 333523776.

It is an arithmetic number, because the mean of its divisors is an integer number (333523776).

Almost surely, 2^667047551 is an apocalyptic number.

667047551 is a deficient number, since it is larger than the sum of its proper divisors (1).

667047551 is an equidigital number, since it uses as much as digits as its factorization.

667047551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 41.

The square root of 667047551 is about 25827.2637149196. The cubic root of 667047551 is about 873.7467996196.

The spelling of 667047551 in words is "six hundred sixty-seven million, forty-seven thousand, five hundred fifty-one".