1665263406026 has 16 divisors (see below), whose sum is σ = 2725055487648. Its totient is φ = 756915966000.

The previous prime is 1665263405989. The next prime is 1665263406041. The reversal of 1665263406026 is 6206043625661.

It is a happy number.

It is a super-2 number, since 2×1665263406026² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308645 + ... + 1850888.

It is an arithmetic number, because the mean of its divisors is an integer number (170315967978).

Almost surely, 2^{1665263406026} is an apocalyptic number.

1665263406026 is a deficient number, since it is larger than the sum of its proper divisors (1059792081622).

1665263406026 is a wasteful number, since it uses less digits than its factorization.

1665263406026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194597.

The product of its (nonzero) digits is 1866240, while the sum is 47.

The spelling of 1665263406026 in words is "one trillion, six hundred sixty-five billion, two hundred sixty-three million, four hundred six thousand, twenty-six".