2455403621521 has 2 divisors, whose sum is σ = 2455403621522. Its totient is φ = 2455403621520.

The previous prime is 2455403621519. The next prime is 2455403621543. The reversal of 2455403621521 is 1251263045542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1865303109121 + 590100512400 = 1365761^2 + 768180^2 .

It is a cyclic number.

It is not a de Polignac number, because 2455403621521 - 2¹ = 2455403621519 is a prime.

Together with 2455403621519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2455403621551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1227701810760 + 1227701810761.

It is an arithmetic number, because the mean of its divisors is an integer number (1227701810761).

Almost surely, 2^{2455403621521} is an apocalyptic number.

It is an amenable number.

2455403621521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2455403621521 is an equidigital number, since it uses as much as digits as its factorization.

2455403621521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288000, while the sum is 40.

The spelling of 2455403621521 in words is "two trillion, four hundred fifty-five billion, four hundred three million, six hundred twenty-one thousand, five hundred twenty-one".