55561777789 has 8 divisors (see below), whose sum is σ = 63501183488. Its totient is φ = 47622874320.

The previous prime is 55561777763. The next prime is 55561777811. The reversal of 55561777789 is 98777716555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55561777789 - 2¹¹ = 55561775741 is a prime.

It is a super-2 number, since 2×55561777789² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55561777709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152599 + ... + 366619.

It is an arithmetic number, because the mean of its divisors is an integer number (7937647936).

Almost surely, 2^55561777789 is an apocalyptic number.

It is an amenable number.

55561777789 is a deficient number, since it is larger than the sum of its proper divisors (7939405699).

55561777789 is a wasteful number, since it uses less digits than its factorization.

55561777789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251115.

The product of its digits is 129654000, while the sum is 67.

The spelling of 55561777789 in words is "fifty-five billion, five hundred sixty-one million, seven hundred seventy-seven thousand, seven hundred eighty-nine".