2155555402000 has 640 divisors, whose sum is σ = 7169067150336. Its totient is φ = 605030400000.

The previous prime is 2155555401991. The next prime is 2155555402019. The reversal of 2155555402000 is 2045555512.

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 82068870 + ... + 82095130.

Almost surely, 2^{2155555402000} is an apocalyptic number.

2155555402000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155555402000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3584533575168).

2155555402000 is an abundant number, since it is smaller than the sum of its proper divisors (5013511748336).

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

2155555402000 is a wasteful number, since it uses less digits than its factorization.

2155555402000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26356 (or 26340 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 34.

The spelling of 2155555402000 in words is "two trillion, one hundred fifty-five billion, five hundred fifty-five million, four hundred two thousand".