667442545 has 32 divisors (see below), whose sum is σ = 1051130880. Its totient is φ = 394165440.

The previous prime is 667442533. The next prime is 667442557. The reversal of 667442545 is 545244766.

It is an interprime number because it is at equal distance from previous prime (667442533) and next prime (667442557).

It is not a de Polignac number, because 667442545 - 2⁵ = 667442513 is a prime.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38307 + ... + 52936.

It is an arithmetic number, because the mean of its divisors is an integer number (32847840).

Almost surely, 2^667442545 is an apocalyptic number.

It is an amenable number.

667442545 is a deficient number, since it is larger than the sum of its proper divisors (383688335).

667442545 is a wasteful number, since it uses less digits than its factorization.

667442545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91285.

The product of its digits is 806400, while the sum is 43.

The square root of 667442545 is about 25834.9094250396. The cubic root of 667442545 is about 873.9192294277.

The spelling of 667442545 in words is "six hundred sixty-seven million, four hundred forty-two thousand, five hundred forty-five".