667515427 has 4 divisors (see below), whose sum is σ = 669180456. Its totient is φ = 665850400.

The previous prime is 667515413. The next prime is 667515437. The reversal of 667515427 is 724515766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 667515427 - 2¹⁹ = 666991139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667515437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831913 + ... + 832714.

It is an arithmetic number, because the mean of its divisors is an integer number (167295114).

Almost surely, 2^667515427 is an apocalyptic number.

667515427 is a deficient number, since it is larger than the sum of its proper divisors (1665029).

667515427 is a wasteful number, since it uses less digits than its factorization.

667515427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665028.

The product of its digits is 352800, while the sum is 43.

The square root of 667515427 is about 25836.3199198338. The cubic root of 667515427 is about 873.9510377402.

The spelling of 667515427 in words is "six hundred sixty-seven million, five hundred fifteen thousand, four hundred twenty-seven".