11953543687 has 2 divisors, whose sum is σ = 11953543688. Its totient is φ = 11953543686.

The previous prime is 11953543643. The next prime is 11953543703. The reversal of 11953543687 is 78634535911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11953543687 - 2³¹ = 9806060039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11953553687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5976771843 + 5976771844.

It is an arithmetic number, because the mean of its divisors is an integer number (5976771844).

Almost surely, 2^11953543687 is an apocalyptic number.

11953543687 is a deficient number, since it is larger than the sum of its proper divisors (1).

11953543687 is an equidigital number, since it uses as much as digits as its factorization.

11953543687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 52.

The spelling of 11953543687 in words is "eleven billion, nine hundred fifty-three million, five hundred forty-three thousand, six hundred eighty-seven".