55777718 has 4 divisors (see below), whose sum is σ = 83666580. Its totient is φ = 27888858.

The previous prime is 55777681. The next prime is 55777723. The reversal of 55777718 is 81777755.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81777755 = 5 ⋅16355551.

It is a super-2 number, since 2×55777718² = 6222307650575048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13944428 + ... + 13944431.

It is an arithmetic number, because the mean of its divisors is an integer number (20916645).

Almost surely, 2^55777718 is an apocalyptic number.

55777718 is a deficient number, since it is larger than the sum of its proper divisors (27888862).

55777718 is a wasteful number, since it uses less digits than its factorization.

55777718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27888861.

The product of its digits is 480200, while the sum is 47.

The square root of 55777718 is about 7468.4481654491. The cubic root of 55777718 is about 382.0793627310.

The spelling of 55777718 in words is "fifty-five million, seven hundred seventy-seven thousand, seven hundred eighteen".