2051533681240 has 16 divisors (see below), whose sum is σ = 4615950782880. Its totient is φ = 820613472480.

The previous prime is 2051533681147. The next prime is 2051533681259. The reversal of 2051533681240 is 421863351502.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 51288342031 = 2051533681240 / (2 + 0 + 5 + 1 + 5 + 3 + 3 + 6 + 8 + 1 + 2 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 2051533681193 and 2051533681202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25644170976 + ... + 25644171055.

It is an arithmetic number, because the mean of its divisors is an integer number (288496923930).

Almost surely, 2^{2051533681240} is an apocalyptic number.

2051533681240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2051533681240 is an abundant number, since it is smaller than the sum of its proper divisors (2564417101640).

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

2051533681240 is a wasteful number, since it uses less digits than its factorization.

2051533681240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51288342042 (or 51288342038 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 2051533681240 in words is "two trillion, fifty-one billion, five hundred thirty-three million, six hundred eighty-one thousand, two hundred forty".