55477557771 has 8 divisors (see below), whose sum is σ = 73978713600. Its totient is φ = 36980720232.

The previous prime is 55477557739. The next prime is 55477557781. The reversal of 55477557771 is 17775577455.

It is a happy number.

55477557771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 55477557771 - 2⁵ = 55477557739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55477557731) 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, 1049475 + ... + 1101068.

It is an arithmetic number, because the mean of its divisors is an integer number (9247339200).

Almost surely, 2^55477557771 is an apocalyptic number.

55477557771 is a deficient number, since it is larger than the sum of its proper divisors (18501155829).

55477557771 is a wasteful number, since it uses less digits than its factorization.

55477557771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159145.

The product of its digits is 42017500, while the sum is 60.

The spelling of 55477557771 in words is "fifty-five billion, four hundred seventy-seven million, five hundred fifty-seven thousand, seven hundred seventy-one".