20240261502557 has 2 divisors, whose sum is σ = 20240261502558. Its totient is φ = 20240261502556.

The previous prime is 20240261502541. The next prime is 20240261502589. The reversal of 20240261502557 is 75520516204202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20126403172516 + 113858330041 = 4486246^2 + 337429^2 .

It is a cyclic number.

It is not a de Polignac number, because 20240261502557 - 2⁴ = 20240261502541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20240261502757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10120130751278 + 10120130751279.

It is an arithmetic number, because the mean of its divisors is an integer number (10120130751279).

Almost surely, 2^{20240261502557} is an apocalyptic number.

It is an amenable number.

20240261502557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20240261502557 is an equidigital number, since it uses as much as digits as its factorization.

20240261502557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336000, while the sum is 41.

Adding to 20240261502557 its reverse (75520516204202), we get a palindrome (95760777706759).

The spelling of 20240261502557 in words is "twenty trillion, two hundred forty billion, two hundred sixty-one million, five hundred two thousand, five hundred fifty-seven".