2645984455758 has 192 divisors, whose sum is σ = 6968380648320. Its totient is φ = 709541683200.

The previous prime is 2645984455757. The next prime is 2645984455783. The reversal of 2645984455758 is 8575544895462.

It is a happy number.

2645984455758 is a `hidden beast` number, since 2 + 6 + 4 + 5 + 9 + 8 + 4 + 45 + 575 + 8 = 666.

It is a super-2 number, since 2×2645984455758² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645984455753) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 41466598 + ... + 41530358.

It is an arithmetic number, because the mean of its divisors is an integer number (36293649210).

Almost surely, 2^{2645984455758} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2645984455758, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3484190324160).

2645984455758 is an abundant number, since it is smaller than the sum of its proper divisors (4322396192562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2645984455758 is a wasteful number, since it uses less digits than its factorization.

2645984455758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64123 (or 64120 counting only the distinct ones).

The product of its digits is 1935360000, while the sum is 72.

The spelling of 2645984455758 in words is "two trillion, six hundred forty-five billion, nine hundred eighty-four million, four hundred fifty-five thousand, seven hundred fifty-eight".