2155460321640 has 32 divisors (see below), whose sum is σ = 6466380965280. Its totient is φ = 574789419072.

The previous prime is 2155460321593. The next prime is 2155460321699. The reversal of 2155460321640 is 461230645512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8981084554 + ... + 8981084793.

It is an arithmetic number, because the mean of its divisors is an integer number (202074405165).

Almost surely, 2^{2155460321640} is an apocalyptic number.

2155460321640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155460321640 is an abundant number, since it is smaller than the sum of its proper divisors (4310920643640).

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

2155460321640 is a wasteful number, since it uses less digits than its factorization.

2155460321640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17962169361 (or 17962169357 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 2155460321640 in words is "two trillion, one hundred fifty-five billion, four hundred sixty million, three hundred twenty-one thousand, six hundred forty".