1009901866638 has 16 divisors (see below), whose sum is σ = 2308347123840. Its totient is φ = 288543390456.

The previous prime is 1009901866531. The next prime is 1009901866643. The reversal of 1009901866638 is 8366681099001.

It is a happy number.

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, 12022641228 + ... + 12022641311.

It is an arithmetic number, because the mean of its divisors is an integer number (144271695240).

Almost surely, 2^{1009901866638} is an apocalyptic number.

1009901866638 is an abundant number, since it is smaller than the sum of its proper divisors (1298445257202).

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

1009901866638 is a wasteful number, since it uses less digits than its factorization.

1009901866638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24045282551.

The product of its (nonzero) digits is 3359232, while the sum is 57.

The spelling of 1009901866638 in words is "one trillion, nine billion, nine hundred one million, eight hundred sixty-six thousand, six hundred thirty-eight".