2015545621920 has 96 divisors (see below), whose sum is σ = 6375533794560. Its totient is φ = 535229936640.

The previous prime is 2015545621867. The next prime is 2015545621931. The reversal of 2015545621920 is 291265455102.

It is a tau number, because it is divible by the number of its divisors (96).

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, 8669911 + ... + 8899350.

It is an arithmetic number, because the mean of its divisors is an integer number (66411810360).

Almost surely, 2^{2015545621920} is an apocalyptic number.

2015545621920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2015545621920 is an abundant number, since it is smaller than the sum of its proper divisors (4359988172640).

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

2015545621920 is a wasteful number, since it uses less digits than its factorization.

2015545621920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17569518 (or 17569510 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 2015545621920 in words is "two trillion, fifteen billion, five hundred forty-five million, six hundred twenty-one thousand, nine hundred twenty".