2644260555420 has 216 divisors, whose sum is σ = 9280409021520. Its totient is φ = 607294195200.

The previous prime is 2644260555353. The next prime is 2644260555421. The reversal of 2644260555420 is 245550624462.

2644260555420 is a `hidden beast` number, since 2 + 6 + 4 + 42 + 60 + 5 + 5 + 542 + 0 = 666.

It is a super-2 number, since 2×2644260555420² (a number of 26 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2644260555421) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2781121 + ... + 3608760.

Almost surely, 2^{2644260555420} is an apocalyptic number.

2644260555420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2644260555420 is an abundant number, since it is smaller than the sum of its proper divisors (6636148466100).

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

2644260555420 is a wasteful number, since it uses less digits than its factorization.

2644260555420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6389937 (or 6389921 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 45.

The spelling of 2644260555420 in words is "two trillion, six hundred forty-four billion, two hundred sixty million, five hundred fifty-five thousand, four hundred twenty".