667614551 has 2 divisors, whose sum is σ = 667614552. Its totient is φ = 667614550.

The previous prime is 667614527. The next prime is 667614581. The reversal of 667614551 is 155416766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667614551 - 2²⁶ = 600505687 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 667614499 and 667614508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667614581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333807275 + 333807276.

It is an arithmetic number, because the mean of its divisors is an integer number (333807276).

Almost surely, 2^667614551 is an apocalyptic number.

667614551 is a deficient number, since it is larger than the sum of its proper divisors (1).

667614551 is an equidigital number, since it uses as much as digits as its factorization.

667614551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 41.

The square root of 667614551 is about 25838.2381558805. The cubic root of 667614551 is about 873.9942952847.

The spelling of 667614551 in words is "six hundred sixty-seven million, six hundred fourteen thousand, five hundred fifty-one".