2051988180481 has 4 divisors (see below), whose sum is σ = 2107447320532. Its totient is φ = 1996529040432.

The previous prime is 2051988180457. The next prime is 2051988180491. The reversal of 2051988180481 is 1840818891502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 993229498881 + 1058758681600 = 996609^2 + 1028960^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2051988180481 is a prime.

It is a super-2 number, since 2×2051988180481² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2051988180491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27729569970 + ... + 27729570043.

It is an arithmetic number, because the mean of its divisors is an integer number (526861830133).

Almost surely, 2^{2051988180481} is an apocalyptic number.

It is an amenable number.

2051988180481 is a deficient number, since it is larger than the sum of its proper divisors (55459140051).

2051988180481 is an equidigital number, since it uses as much as digits as its factorization.

2051988180481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55459140050.

The product of its (nonzero) digits is 1474560, while the sum is 55.

The spelling of 2051988180481 in words is "two trillion, fifty-one billion, nine hundred eighty-eight million, one hundred eighty thousand, four hundred eighty-one".