55532777808 has 80 divisors (see below), whose sum is σ = 148023025920. Its totient is φ = 17930231808.

The previous prime is 55532777771. The next prime is 55532777821. The reversal of 55532777808 is 80877723555.

It is a super-2 number, since 2×55532777808² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91948 + ... + 345716.

It is an arithmetic number, because the mean of its divisors is an integer number (1850287824).

Almost surely, 2^55532777808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55532777808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74011512960).

55532777808 is an abundant number, since it is smaller than the sum of its proper divisors (92490248112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55532777808 is a wasteful number, since it uses less digits than its factorization.

55532777808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253924 (or 253918 counting only the distinct ones).

The product of its (nonzero) digits is 16464000, while the sum is 57.

The spelling of 55532777808 in words is "fifty-five billion, five hundred thirty-two million, seven hundred seventy-seven thousand, eight hundred eight".