1665061744923 has 48 divisors (see below), whose sum is σ = 2480345387520. Its totient is φ = 1075730544000.

The previous prime is 1665061744889. The next prime is 1665061744963. The reversal of 1665061744923 is 3294471605661.

It is a happy number.

1665061744923 is a `hidden beast` number, since 1 + 6 + 6 + 506 + 1 + 7 + 44 + 92 + 3 = 666.

It is not a de Polignac number, because 1665061744923 - 2²² = 1665057550619 is a prime.

It is a super-2 number, since 2×1665061744923² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1665061744923.

It is not an unprimeable number, because it can be changed into a prime (1665061744963) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49011663 + ... + 49045623.

It is an arithmetic number, because the mean of its divisors is an integer number (51673862240).

Almost surely, 2^{1665061744923} is an apocalyptic number.

1665061744923 is a deficient number, since it is larger than the sum of its proper divisors (815283642597).

1665061744923 is a wasteful number, since it uses less digits than its factorization.

1665061744923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35000 (or 34997 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 1665061744923 in words is "one trillion, six hundred sixty-five billion, sixty-one million, seven hundred forty-four thousand, nine hundred twenty-three".