2540521221551 has 2 divisors, whose sum is σ = 2540521221552. Its totient is φ = 2540521221550.

The previous prime is 2540521221533. The next prime is 2540521221577. The reversal of 2540521221551 is 1551221250452.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2540521221551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2540521221521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1270260610775 + 1270260610776.

It is an arithmetic number, because the mean of its divisors is an integer number (1270260610776).

Almost surely, 2^{2540521221551} is an apocalyptic number.

2540521221551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2540521221551 is an equidigital number, since it uses as much as digits as its factorization.

2540521221551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40000, while the sum is 35.

The spelling of 2540521221551 in words is "two trillion, five hundred forty billion, five hundred twenty-one million, two hundred twenty-one thousand, five hundred fifty-one".