66406377 has 4 divisors (see below), whose sum is σ = 88541840. Its totient is φ = 44270916.

The previous prime is 66406367. The next prime is 66406409. The reversal of 66406377 is 77360466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66406377 - 2¹⁸ = 66144233 is a prime.

It is a super-2 number, since 2×66406377² = 8819613812532258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66406357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11067727 + ... + 11067732.

It is an arithmetic number, because the mean of its divisors is an integer number (22135460).

Almost surely, 2^66406377 is an apocalyptic number.

It is an amenable number.

66406377 is a deficient number, since it is larger than the sum of its proper divisors (22135463).

66406377 is a wasteful number, since it uses less digits than its factorization.

66406377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22135462.

The product of its (nonzero) digits is 127008, while the sum is 39.

The square root of 66406377 is about 8149.0107988639. The cubic root of 66406377 is about 404.9517333121.

The spelling of 66406377 in words is "sixty-six million, four hundred six thousand, three hundred seventy-seven".