1999809137455 has 16 divisors (see below), whose sum is σ = 2542262415264. Its totient is φ = 1504951413760.

The previous prime is 1999809137429. The next prime is 1999809137467. The reversal of 1999809137455 is 5547319089991.

It is not a de Polignac number, because 1999809137455 - 2²¹ = 1999807040303 is a prime.

It is a super-2 number, since 2×1999809137455² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

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, 5986681 + ... + 6311890.

It is an arithmetic number, because the mean of its divisors is an integer number (158891400954).

Almost surely, 2^{1999809137455} is an apocalyptic number.

1999809137455 is a deficient number, since it is larger than the sum of its proper divisors (542453277809).

1999809137455 is a wasteful number, since it uses less digits than its factorization.

1999809137455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12300506.

The product of its (nonzero) digits is 110224800, while the sum is 70.

The spelling of 1999809137455 in words is "one trillion, nine hundred ninety-nine billion, eight hundred nine million, one hundred thirty-seven thousand, four hundred fifty-five".