2155565505464 has 288 divisors, whose sum is σ = 5164043888640. Its totient is φ = 825359673600.

The previous prime is 2155565505461. The next prime is 2155565505479. The reversal of 2155565505464 is 4645055655512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155565505461) 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, 772325909 + ... + 772328699.

Almost surely, 2^{2155565505464} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155565505464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2582021944320).

2155565505464 is an abundant number, since it is smaller than the sum of its proper divisors (3008478383176).

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

2155565505464 is a wasteful number, since it uses less digits than its factorization.

2155565505464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2939 (or 2883 counting only the distinct ones).

The product of its (nonzero) digits is 18000000, while the sum is 53.

The spelling of 2155565505464 in words is "two trillion, one hundred fifty-five billion, five hundred sixty-five million, five hundred five thousand, four hundred sixty-four".