1563540263501 has 2 divisors, whose sum is σ = 1563540263502. Its totient is φ = 1563540263500.

The previous prime is 1563540263497. The next prime is 1563540263503. The reversal of 1563540263501 is 1053620453651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1213015876900 + 350524386601 = 1101370^2 + 592051^2 .

It is a cyclic number.

It is not a de Polignac number, because 1563540263501 - 2² = 1563540263497 is a prime.

Together with 1563540263503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1563540263503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 781770131750 + 781770131751.

It is an arithmetic number, because the mean of its divisors is an integer number (781770131751).

Almost surely, 2^{1563540263501} is an apocalyptic number.

It is an amenable number.

1563540263501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1563540263501 is an equidigital number, since it uses as much as digits as its factorization.

1563540263501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 1563540263501 in words is "one trillion, five hundred sixty-three billion, five hundred forty million, two hundred sixty-three thousand, five hundred one".