66776343 has 16 divisors (see below), whose sum is σ = 91571040. Its totient is φ = 43265664.

The previous prime is 66776329. The next prime is 66776399. The reversal of 66776343 is 34367766.

It is not a de Polignac number, because 66776343 - 2⁴ = 66776327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66776295 and 66776304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66776243) 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, 15405 + ... + 19257.

It is an arithmetic number, because the mean of its divisors is an integer number (5723190).

Almost surely, 2^66776343 is an apocalyptic number.

66776343 is a deficient number, since it is larger than the sum of its proper divisors (24794697).

66776343 is a wasteful number, since it uses less digits than its factorization.

66776343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4018.

The product of its digits is 381024, while the sum is 42.

The square root of 66776343 is about 8171.6793255732. The cubic root of 66776343 is about 405.7023690837.

The spelling of 66776343 in words is "sixty-six million, seven hundred seventy-six thousand, three hundred forty-three".