1956811982799 has 16 divisors (see below), whose sum is σ = 2657583905408. Its totient is φ = 1280431275552.

The previous prime is 1956811982753. The next prime is 1956811982809. The reversal of 1956811982799 is 9972891186591.

It is a de Polignac number, because none of the positive numbers 2^k-1956811982799 is a prime.

It is a super-2 number, since 2×1956811982799² (a number of 25 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 1956811982799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1956811982299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17517217 + ... + 17628570.

It is an arithmetic number, because the mean of its divisors is an integer number (166098994088).

Almost surely, 2^{1956811982799} is an apocalyptic number.

1956811982799 is a deficient number, since it is larger than the sum of its proper divisors (700771922609).

1956811982799 is a wasteful number, since it uses less digits than its factorization.

1956811982799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35146134.

The product of its digits is 176359680, while the sum is 75.

The spelling of 1956811982799 in words is "one trillion, nine hundred fifty-six billion, eight hundred eleven million, nine hundred eighty-two thousand, seven hundred ninety-nine".