1999791951628 has 48 divisors (see below), whose sum is σ = 3721986967104. Its totient is φ = 936899758080.

The previous prime is 1999791951617. The next prime is 1999791951691. The reversal of 1999791951628 is 8261591979991.

It is a super-2 number, since 2×1999791951628² (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 15 ways as a sum of consecutive naturals, for example, 13993825 + ... + 14136007.

It is an arithmetic number, because the mean of its divisors is an integer number (77541395148).

Almost surely, 2^{1999791951628} is an apocalyptic number.

It is an amenable number.

1999791951628 is a deficient number, since it is larger than the sum of its proper divisors (1722195015476).

1999791951628 is a wasteful number, since it uses less digits than its factorization.

1999791951628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143122 (or 143120 counting only the distinct ones).

The product of its digits is 198404640, while the sum is 76.

The spelling of 1999791951628 in words is "one trillion, nine hundred ninety-nine billion, seven hundred ninety-one million, nine hundred fifty-one thousand, six hundred twenty-eight".