124020542343557 has 2 divisors, whose sum is σ = 124020542343558. Its totient is φ = 124020542343556.

The previous prime is 124020542343469. The next prime is 124020542343661. The reversal of 124020542343557 is 755343245020421.

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., 118706821210756 + 5313721132801 = 10895266^2 + 2305151^2 .

It is a cyclic number.

It is not a de Polignac number, because 124020542343557 - 2¹⁶ = 124020542278021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124020542343157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62010271171778 + 62010271171779.

It is an arithmetic number, because the mean of its divisors is an integer number (62010271171779).

Almost surely, 2^{124020542343557} is an apocalyptic number.

It is an amenable number.

124020542343557 is a deficient number, since it is larger than the sum of its proper divisors (1).

124020542343557 is an equidigital number, since it uses as much as digits as its factorization.

124020542343557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032000, while the sum is 47.

Adding to 124020542343557 its reverse (755343245020421), we get a palindrome (879363787363978).

The spelling of 124020542343557 in words is "one hundred twenty-four trillion, twenty billion, five hundred forty-two million, three hundred forty-three thousand, five hundred fifty-seven".