1242543536641 has 16 divisors (see below), whose sum is σ = 1439822945088. Its totient is φ = 1059742195200.

The previous prime is 1242543536627. The next prime is 1242543536657. The reversal of 1242543536641 is 1466353452421.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242543536641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1242543536591 and 1242543536600.

It is not an unprimeable number, because it can be changed into a prime (1242543506641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10555875 + ... + 10672936.

It is an arithmetic number, because the mean of its divisors is an integer number (89988934068).

Almost surely, 2^{1242543536641} is an apocalyptic number.

1242543536641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1242543536641 is a deficient number, since it is larger than the sum of its proper divisors (197279408447).

1242543536641 is a wasteful number, since it uses less digits than its factorization.

1242543536641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21229152.

The product of its digits is 2073600, while the sum is 46.

The spelling of 1242543536641 in words is "one trillion, two hundred forty-two billion, five hundred forty-three million, five hundred thirty-six thousand, six hundred forty-one".