55100400400 has 30 divisors (see below), whose sum is σ = 132378712922. Its totient is φ = 22040160000.

The previous prime is 55100400379. The next prime is 55100400413. The reversal of 55100400400 is 400400155.

It can be written as a sum of positive squares in 3 ways, for example, as 3493282816 + 51607117584 = 59104^2 + 227172^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68875101 + ... + 68875900.

Almost surely, 2^55100400400 is an apocalyptic number.

55100400400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55100400400 is an abundant number, since it is smaller than the sum of its proper divisors (77278312522).

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

55100400400 is a wasteful number, since it uses less digits than its factorization.

55100400400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137751019 (or 137751008 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

Adding to 55100400400 its reverse (400400155), we get a palindrome (55500800555).

The spelling of 55100400400 in words is "fifty-five billion, one hundred million, four hundred thousand, four hundred".