9999955621622 has 32 divisors (see below), whose sum is σ = 15862881369600. Its totient is φ = 4720212575008.

The previous prime is 9999955621619. The next prime is 9999955621637. The reversal of 9999955621622 is 2261265599999.

It is a super-2 number, since 2×9999955621622² (a number of 27 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 9999955621622.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 977813 + ... + 4577775.

It is an arithmetic number, because the mean of its divisors is an integer number (495715042800).

Almost surely, 2^{9999955621622} is an apocalyptic number.

9999955621622 is a deficient number, since it is larger than the sum of its proper divisors (5862925747978).

9999955621622 is a wasteful number, since it uses less digits than its factorization.

9999955621622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601060.

The product of its digits is 425152800, while the sum is 74.

The spelling of 9999955621622 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred fifty-five million, six hundred twenty-one thousand, six hundred twenty-two".