10505555555531 has 2 divisors, whose sum is σ = 10505555555532. Its totient is φ = 10505555555530.

The previous prime is 10505555555503. The next prime is 10505555555623. The reversal of 10505555555531 is 13555555550501.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10505555555531 is a prime.

It is a super-2 number, since 2×10505555555531² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10505555555531.

It is not a weakly prime, because it can be changed into another prime (10505555557531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252777777765 + 5252777777766.

It is an arithmetic number, because the mean of its divisors is an integer number (5252777777766).

Almost surely, 2^{10505555555531} is an apocalyptic number.

10505555555531 is a deficient number, since it is larger than the sum of its proper divisors (1).

10505555555531 is an equidigital number, since it uses as much as digits as its factorization.

10505555555531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5859375, while the sum is 50.

The spelling of 10505555555531 in words is "ten trillion, five hundred five billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred thirty-one".