55777558 has 4 divisors (see below), whose sum is σ = 83666340. Its totient is φ = 27888778.

The previous prime is 55777549. The next prime is 55777609. The reversal of 55777558 is 85577755.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×55777558² = 6222271952886728, 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, 13944388 + ... + 13944391.

It is an arithmetic number, because the mean of its divisors is an integer number (20916585).

Almost surely, 2^55777558 is an apocalyptic number.

55777558 is a deficient number, since it is larger than the sum of its proper divisors (27888782).

55777558 is a wasteful number, since it uses less digits than its factorization.

55777558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27888781.

The product of its digits is 1715000, while the sum is 49.

The square root of 55777558 is about 7468.4374537115. The cubic root of 55777558 is about 382.0789973954.

The spelling of 55777558 in words is "fifty-five million, seven hundred seventy-seven thousand, five hundred fifty-eight".