20954165415185 has 8 divisors (see below), whose sum is σ = 25824593052456. Its totient is φ = 16310269296000.

The previous prime is 20954165415179. The next prime is 20954165415203. The reversal of 20954165415185 is 58151456145902.

It is a happy number.

It is a Cunningham number, because it is equal to 4577572²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1989194310544 + 18964971104641 = 1410388^2 + 4354879^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20954165415185 - 2²⁰ = 20954164366609 is a prime.

It is a super-3 number, since 3×20954165415185³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20954165415185.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56632879316 + ... + 56632879685.

It is an arithmetic number, because the mean of its divisors is an integer number (3228074131557).

Almost surely, 2^{20954165415185} is an apocalyptic number.

It is an amenable number.

20954165415185 is a deficient number, since it is larger than the sum of its proper divisors (4870427637271).

20954165415185 is a wasteful number, since it uses less digits than its factorization.

20954165415185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113265759043.

The product of its (nonzero) digits is 8640000, while the sum is 56.

The spelling of 20954165415185 in words is "twenty trillion, nine hundred fifty-four billion, one hundred sixty-five million, four hundred fifteen thousand, one hundred eighty-five".