2551763442491 has 4 divisors (see below), whose sum is σ = 2599909922592. Its totient is φ = 2503616962392.

The previous prime is 2551763442469. The next prime is 2551763442497. The reversal of 2551763442491 is 1942443671552.

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

It is a cyclic number.

It is not a de Polignac number, because 2551763442491 - 2⁶ = 2551763442427 is a prime.

It is a super-2 number, since 2×2551763442491² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 48146480047 = 2551763442491 / (2 + 5 + 5 + 1 + 7 + 6 + 3 + 4 + 4 + 2 + 4 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2551763442497) 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 3 ways as a sum of consecutive naturals, for example, 24073239971 + ... + 24073240076.

It is an arithmetic number, because the mean of its divisors is an integer number (649977480648).

Almost surely, 2^{2551763442491} is an apocalyptic number.

2551763442491 is a deficient number, since it is larger than the sum of its proper divisors (48146480101).

2551763442491 is an equidigital number, since it uses as much as digits as its factorization.

2551763442491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48146480100.

The product of its digits is 7257600, while the sum is 53.

The spelling of 2551763442491 in words is "two trillion, five hundred fifty-one billion, seven hundred sixty-three million, four hundred forty-two thousand, four hundred ninety-one".