2155432756664 has 64 divisors (see below), whose sum is σ = 4481807431680. Its totient is φ = 963532080000.

The previous prime is 2155432756639. The next prime is 2155432756721. The reversal of 2155432756664 is 4666572345512.

It is a super-3 number, since 3×2155432756664³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39432857 + ... + 39487479.

It is an arithmetic number, because the mean of its divisors is an integer number (70028241120).

Almost surely, 2^{2155432756664} 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 2155432756664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2240903715840).

2155432756664 is an abundant number, since it is smaller than the sum of its proper divisors (2326374675016).

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

2155432756664 is a wasteful number, since it uses less digits than its factorization.

2155432756664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62052 (or 62048 counting only the distinct ones).

The product of its digits is 36288000, while the sum is 56.

The spelling of 2155432756664 in words is "two trillion, one hundred fifty-five billion, four hundred thirty-two million, seven hundred fifty-six thousand, six hundred sixty-four".