2164640343725 has 24 divisors (see below), whose sum is σ = 2855514967488. Its totient is φ = 1622122387200.

The previous prime is 2164640343721. The next prime is 2164640343743. The reversal of 2164640343725 is 5273430464612.

It is not a de Polignac number, because 2164640343725 - 2² = 2164640343721 is a prime.

It is a super-2 number, since 2×2164640343725² (a number of 25 digits) contains 22 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 2164640343725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164640343721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11979689 + ... + 12159038.

It is an arithmetic number, because the mean of its divisors is an integer number (118979790312).

Almost surely, 2^{2164640343725} is an apocalyptic number.

2164640343725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2164640343725 is a deficient number, since it is larger than the sum of its proper divisors (690874623763).

2164640343725 is a wasteful number, since it uses less digits than its factorization.

2164640343725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24138965 (or 24138960 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 47.

The spelling of 2164640343725 in words is "two trillion, one hundred sixty-four billion, six hundred forty million, three hundred forty-three thousand, seven hundred twenty-five".