2155438934000 has 80 divisors (see below), whose sum is σ = 5685656067936. Its totient is φ = 783795968000.

The previous prime is 2155438933987. The next prime is 2155438934009. The reversal of 2155438934000 is 4398345512.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155438934009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48965249 + ... + 49009248.

Almost surely, 2^{2155438934000} is an apocalyptic number.

2155438934000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155438934000 is an abundant number, since it is smaller than the sum of its proper divisors (3530217133936).

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

2155438934000 is a wasteful number, since it uses less digits than its factorization.

2155438934000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97974531 (or 97974515 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 2155438934000 in words is "two trillion, one hundred fifty-five billion, four hundred thirty-eight million, nine hundred thirty-four thousand".