1665489958634 has 8 divisors (see below), whose sum is σ = 2498301618660. Its totient is φ = 832722752416.

The previous prime is 1665489958609. The next prime is 1665489958637. The reversal of 1665489958634 is 4368599845661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1628239800625 + 37250158009 = 1276025^2 + 193003^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1665489958634² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1665489958637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11019629 + ... + 11169744.

Almost surely, 2^{1665489958634} is an apocalyptic number.

1665489958634 is a deficient number, since it is larger than the sum of its proper divisors (832811660026).

1665489958634 is a wasteful number, since it uses less digits than its factorization.

1665489958634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22226904.

The product of its digits is 1343692800, while the sum is 74.

The spelling of 1665489958634 in words is "one trillion, six hundred sixty-five billion, four hundred eighty-nine million, nine hundred fifty-eight thousand, six hundred thirty-four".