66797782 has 4 divisors (see below), whose sum is σ = 100196676. Its totient is φ = 33398890.

The previous prime is 66797779. The next prime is 66797821. The reversal of 66797782 is 28779766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28779766 = 2 ⋅14389883.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16699444 + ... + 16699447.

It is an arithmetic number, because the mean of its divisors is an integer number (25049169).

Almost surely, 2^66797782 is an apocalyptic number.

66797782 is a deficient number, since it is larger than the sum of its proper divisors (33398894).

66797782 is a wasteful number, since it uses less digits than its factorization.

66797782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33398893.

The product of its digits is 1778112, while the sum is 52.

The square root of 66797782 is about 8172.9910069692. The cubic root of 66797782 is about 405.7457822748.

The spelling of 66797782 in words is "sixty-six million, seven hundred ninety-seven thousand, seven hundred eighty-two".