667554739 has 2 divisors, whose sum is σ = 667554740. Its totient is φ = 667554738.

The previous prime is 667554697. The next prime is 667554749. The reversal of 667554739 is 937455766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667554739 - 2¹⁹ = 667030451 is a prime.

It is a super-2 number, since 2×667554739² = 891258659122716242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (667554749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333777369 + 333777370.

It is an arithmetic number, because the mean of its divisors is an integer number (333777370).

Almost surely, 2^667554739 is an apocalyptic number.

667554739 is a deficient number, since it is larger than the sum of its proper divisors (1).

667554739 is an equidigital number, since it uses as much as digits as its factorization.

667554739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4762800, while the sum is 52.

The square root of 667554739 is about 25837.0806980975. The cubic root of 667554739 is about 873.9681939423.

The spelling of 667554739 in words is "six hundred sixty-seven million, five hundred fifty-four thousand, seven hundred thirty-nine".