19975855790969 has 16 divisors (see below), whose sum is σ = 21640559622864. Its totient is φ = 18329538988800.

The previous prime is 19975855790929. The next prime is 19975855791013. The reversal of 19975855790969 is 96909755857991.

It can be written as a sum of positive squares in 8 ways, for example, as 9739311499369 + 10236544291600 = 3120787^2 + 3199460^2 .

It is not a de Polignac number, because 19975855790969 - 2²⁸ = 19975587355513 is a prime.

It is a super-2 number, since 2×19975855790969² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19975855790929) 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, 3695147 + ... + 7321599.

It is an arithmetic number, because the mean of its divisors is an integer number (1352534976429).

Almost surely, 2^{19975855790969} is an apocalyptic number.

It is an amenable number.

19975855790969 is a deficient number, since it is larger than the sum of its proper divisors (1664703831895).

19975855790969 is a wasteful number, since it uses less digits than its factorization.

19975855790969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628988.

The product of its (nonzero) digits is 17360406000, while the sum is 89.

The spelling of 19975855790969 in words is "nineteen trillion, nine hundred seventy-five billion, eight hundred fifty-five million, seven hundred ninety thousand, nine hundred sixty-nine".