66607867 has 16 divisors (see below), whose sum is σ = 70567200. Its totient is φ = 62782720.

The previous prime is 66607861. The next prime is 66607889. The reversal of 66607867 is 76870666.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66607867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66607861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338013 + ... + 338209.

It is an arithmetic number, because the mean of its divisors is an integer number (4410450).

Almost surely, 2^66607867 is an apocalyptic number.

66607867 is the 5162-nd heptagonal number.

66607867 is a deficient number, since it is larger than the sum of its proper divisors (3959333).

66607867 is a wasteful number, since it uses less digits than its factorization.

66607867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446.

The product of its (nonzero) digits is 508032, while the sum is 46.

The square root of 66607867 is about 8161.3642854611. The cubic root of 66607867 is about 405.3608874900.

The spelling of 66607867 in words is "sixty-six million, six hundred seven thousand, eight hundred sixty-seven".