66677897 has 48 divisors (see below), whose sum is σ = 87588480. Its totient is φ = 50181120.

The previous prime is 66677887. The next prime is 66677983. The reversal of 66677897 is 79877666.

It is not a de Polignac number, because 66677897 - 2⁴ = 66677881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66677827) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 687353 + ... + 687449.

It is an arithmetic number, because the mean of its divisors is an integer number (1824760).

Almost surely, 2^66677897 is an apocalyptic number.

It is an amenable number.

66677897 is a deficient number, since it is larger than the sum of its proper divisors (20910583).

66677897 is a wasteful number, since it uses less digits than its factorization.

66677897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 163 counting only the distinct ones).

The product of its digits is 5334336, while the sum is 56.

The square root of 66677897 is about 8165.6534949752. The cubic root of 66677897 is about 405.5029001451.

The spelling of 66677897 in words is "sixty-six million, six hundred seventy-seven thousand, eight hundred ninety-seven".