1665724697122 has 16 divisors (see below), whose sum is σ = 2557490870880. Its totient is φ = 813239818272.

The previous prime is 1665724697083. The next prime is 1665724697129. The reversal of 1665724697122 is 2217964275661.

It is not an unprimeable number, because it can be changed into a prime (1665724697129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2741928 + ... + 3293875.

It is an arithmetic number, because the mean of its divisors is an integer number (159843179430).

Almost surely, 2^{1665724697122} is an apocalyptic number.

1665724697122 is a deficient number, since it is larger than the sum of its proper divisors (891766173758).

1665724697122 is a wasteful number, since it uses less digits than its factorization.

1665724697122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6039057.

The product of its digits is 15240960, while the sum is 58.

The spelling of 1665724697122 in words is "one trillion, six hundred sixty-five billion, seven hundred twenty-four million, six hundred ninety-seven thousand, one hundred twenty-two".