66131943782 has 4 divisors (see below), whose sum is σ = 99197915676. Its totient is φ = 33065971890.

The previous prime is 66131943767. The next prime is 66131943791. The reversal of 66131943782 is 28734913166.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66131943782.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16532985944 + ... + 16532985947.

It is an arithmetic number, because the mean of its divisors is an integer number (24799478919).

Almost surely, 2^66131943782 is an apocalyptic number.

66131943782 is a deficient number, since it is larger than the sum of its proper divisors (33065971894).

66131943782 is a wasteful number, since it uses less digits than its factorization.

66131943782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33065971893.

The product of its digits is 1306368, while the sum is 50.

The spelling of 66131943782 in words is "sixty-six billion, one hundred thirty-one million, nine hundred forty-three thousand, seven hundred eighty-two".