55778553 has 6 divisors (see below), whose sum is σ = 80569034. Its totient is φ = 37185696.

The previous prime is 55778551. The next prime is 55778557. The reversal of 55778553 is 35587755.

It can be written as a sum of positive squares in only one way, i.e., 42029289 + 13749264 = 6483^2 + 3708^2 .

It is not a de Polignac number, because 55778553 - 2¹ = 55778551 is a prime.

It is a super-2 number, since 2×55778553² = 6222493949547618, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55778499 and 55778508.

It is not an unprimeable number, because it can be changed into a prime (55778551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3098800 + ... + 3098817.

Almost surely, 2^55778553 is an apocalyptic number.

It is an amenable number.

55778553 is a deficient number, since it is larger than the sum of its proper divisors (24790481).

55778553 is a wasteful number, since it uses less digits than its factorization.

55778553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6197623 (or 6197620 counting only the distinct ones).

The product of its digits is 735000, while the sum is 45.

The square root of 55778553 is about 7468.5040670806. The cubic root of 55778553 is about 382.0812693148.

The spelling of 55778553 in words is "fifty-five million, seven hundred seventy-eight thousand, five hundred fifty-three".