66478377 has 16 divisors (see below), whose sum is σ = 103213440. Its totient is φ = 37270272.

The previous prime is 66478333. The next prime is 66478393. The reversal of 66478377 is 77387466.

It is not a de Polignac number, because 66478377 - 2¹¹ = 66476329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66473377) 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, 28752 + ... + 30977.

It is an arithmetic number, because the mean of its divisors is an integer number (6450840).

Almost surely, 2^66478377 is an apocalyptic number.

It is an amenable number.

66478377 is a deficient number, since it is larger than the sum of its proper divisors (36735063).

66478377 is a wasteful number, since it uses less digits than its factorization.

66478377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59792.

The product of its digits is 1185408, while the sum is 48.

The square root of 66478377 is about 8153.4273161659. The cubic root of 66478377 is about 405.0980344906.

The spelling of 66478377 in words is "sixty-six million, four hundred seventy-eight thousand, three hundred seventy-seven".