145638820806 has 16 divisors (see below), whose sum is σ = 291340029744. Its totient is φ = 48535875584.

The previous prime is 145638820799. The next prime is 145638820879. The reversal of 145638820806 is 608028836541.

It is a happy number.

It is a super-4 number, since 4×145638820806⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

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, 2569131 + ... + 2625206.

It is an arithmetic number, because the mean of its divisors is an integer number (18208751859).

Almost surely, 2^145638820806 is an apocalyptic number.

145638820806 is an abundant number, since it is smaller than the sum of its proper divisors (145701208938).

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

145638820806 is a wasteful number, since it uses less digits than its factorization.

145638820806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5199015.

The product of its (nonzero) digits is 2211840, while the sum is 51.

The spelling of 145638820806 in words is "one hundred forty-five billion, six hundred thirty-eight million, eight hundred twenty thousand, eight hundred six".