55840687687 has 2 divisors, whose sum is σ = 55840687688. Its totient is φ = 55840687686.

The previous prime is 55840687667. The next prime is 55840687691. The reversal of 55840687687 is 78678604855.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55840687687 - 2¹¹ = 55840685639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55840687657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27920343843 + 27920343844.

It is an arithmetic number, because the mean of its divisors is an integer number (27920343844).

Almost surely, 2^55840687687 is an apocalyptic number.

55840687687 is a deficient number, since it is larger than the sum of its proper divisors (1).

55840687687 is an equidigital number, since it uses as much as digits as its factorization.

55840687687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90316800, while the sum is 64.

The spelling of 55840687687 in words is "fifty-five billion, eight hundred forty million, six hundred eighty-seven thousand, six hundred eighty-seven".