5551981257599 has 12 divisors (see below), whose sum is σ = 6536239557624. Its totient is φ = 4701505639824.

The previous prime is 5551981257577. The next prime is 5551981257689. The reversal of 5551981257599 is 9957521891555.

It is a happy number.

It is not a de Polignac number, because 5551981257599 - 2²⁴ = 5551964480383 is a prime.

It is a Smith number, since the sum of its digits (71) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5551981257899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 682560632 + ... + 682568765.

It is an arithmetic number, because the mean of its divisors is an integer number (544686629802).

Almost surely, 2^{5551981257599} is an apocalyptic number.

5551981257599 is a deficient number, since it is larger than the sum of its proper divisors (984258300025).

5551981257599 is a wasteful number, since it uses less digits than its factorization.

5551981257599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1365129494 (or 1365129487 counting only the distinct ones).

The product of its digits is 255150000, while the sum is 71.

The spelling of 5551981257599 in words is "five trillion, five hundred fifty-one billion, nine hundred eighty-one million, two hundred fifty-seven thousand, five hundred ninety-nine".