2168718525 has 18 divisors (see below), whose sum is σ = 3884416250. Its totient is φ = 1156649760.

The previous prime is 2168718523. The next prime is 2168718527. The reversal of 2168718525 is 5258178612.

It is an interprime number because it is at equal distance from previous prime (2168718523) and next prime (2168718527).

It can be written as a sum of positive squares in 3 ways, for example, as 171164889 + 1997553636 = 13083^2 + 44694^2 .

It is not a de Polignac number, because 2168718525 - 2¹ = 2168718523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2168718521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4819150 + ... + 4819599.

Almost surely, 2^2168718525 is an apocalyptic number.

2168718525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2168718525 is a deficient number, since it is larger than the sum of its proper divisors (1715697725).

2168718525 is a wasteful number, since it uses less digits than its factorization.

2168718525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9638765 (or 9638757 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The square root of 2168718525 is about 46569.5020909608. The cubic root of 2168718525 is about 1294.3976915144.

The spelling of 2168718525 in words is "two billion, one hundred sixty-eight million, seven hundred eighteen thousand, five hundred twenty-five".