2051355026440 has 32 divisors (see below), whose sum is σ = 4615681412160. Its totient is φ = 820518436800.

The previous prime is 2051355026431. The next prime is 2051355026449. The reversal of 2051355026440 is 446205531502.

It is an interprime number because it is at equal distance from previous prime (2051355026431) and next prime (2051355026449).

It is a self number, because there is not a number n which added to its sum of digits gives 2051355026440.

It is not an unprimeable number, because it can be changed into a prime (2051355026449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 707995 + ... + 2145685.

It is an arithmetic number, because the mean of its divisors is an integer number (144240044130).

Almost surely, 2^{2051355026440} is an apocalyptic number.

2051355026440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2051355026440 is an abundant number, since it is smaller than the sum of its proper divisors (2564326385720).

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

2051355026440 is a wasteful number, since it uses less digits than its factorization.

2051355026440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473373 (or 1473369 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 2051355026440 in words is "two trillion, fifty-one billion, three hundred fifty-five million, twenty-six thousand, four hundred forty".