5457520256521 has 2 divisors, whose sum is σ = 5457520256522. Its totient is φ = 5457520256520.

The previous prime is 5457520256467. The next prime is 5457520256533. The reversal of 5457520256521 is 1256520257545.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3240432014400 + 2217088242121 = 1800120^2 + 1488989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5457520256521 is a prime.

It is not a weakly prime, because it can be changed into another prime (5457520257521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2728760128260 + 2728760128261.

It is an arithmetic number, because the mean of its divisors is an integer number (2728760128261).

Almost surely, 2^{5457520256521} is an apocalyptic number.

It is an amenable number.

5457520256521 is a deficient number, since it is larger than the sum of its proper divisors (1).

5457520256521 is an equidigital number, since it uses as much as digits as its factorization.

5457520256521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200000, while the sum is 49.

The spelling of 5457520256521 in words is "five trillion, four hundred fifty-seven billion, five hundred twenty million, two hundred fifty-six thousand, five hundred twenty-one".