55213777 has 8 divisors (see below), whose sum is σ = 57867264. Its totient is φ = 52581408.

The previous prime is 55213747. The next prime is 55213787. The reversal of 55213777 is 77731255.

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

It is a cyclic number.

It is not a de Polignac number, because 55213777 - 2¹¹ = 55211729 is a prime.

It is a super-2 number, since 2×55213777² = 6097122341211458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55213727) 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, 208 + ... + 10510.

It is an arithmetic number, because the mean of its divisors is an integer number (7233408).

Almost surely, 2^55213777 is an apocalyptic number.

It is an amenable number.

55213777 is a deficient number, since it is larger than the sum of its proper divisors (2653487).

55213777 is a wasteful number, since it uses less digits than its factorization.

55213777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10559.

The product of its digits is 51450, while the sum is 37.

The square root of 55213777 is about 7430.5973514920. The cubic root of 55213777 is about 380.7873265127.

The spelling of 55213777 in words is "fifty-five million, two hundred thirteen thousand, seven hundred seventy-seven".