665682621453822 has 64 divisors (see below), whose sum is σ = 1601875784171520. Its totient is φ = 180158513714784.

The previous prime is 665682621453821. The next prime is 665682621453919. The reversal of 665682621453822 is 228354126286566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665682621453821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55297678 + ... + 66251025.

It is an arithmetic number, because the mean of its divisors is an integer number (25029309127680).

Almost surely, 2^{665682621453822} is an apocalyptic number.

665682621453822 is an abundant number, since it is smaller than the sum of its proper divisors (936193162717698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665682621453822 is a wasteful number, since it uses less digits than its factorization.

665682621453822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121555597.

The product of its digits is 398131200, while the sum is 66.

The spelling of 665682621453822 in words is "six hundred sixty-five trillion, six hundred eighty-two billion, six hundred twenty-one million, four hundred fifty-three thousand, eight hundred twenty-two".