55001031440 has 20 divisors (see below), whose sum is σ = 127877398284. Its totient is φ = 22000412544.

The previous prime is 55001031409. The next prime is 55001031467. The reversal of 55001031440 is 4413010055.

It can be written as a sum of positive squares in 2 ways, for example, as 40412256784 + 14588774656 = 201028^2 + 120784^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×55001031440² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343756367 + ... + 343756526.

Almost surely, 2^55001031440 is an apocalyptic number.

It is an amenable number.

55001031440 is an abundant number, since it is smaller than the sum of its proper divisors (72876366844).

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

55001031440 is a wasteful number, since it uses less digits than its factorization.

55001031440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687512906 (or 687512900 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 55001031440 its reverse (4413010055), we get a palindrome (59414041495).

The spelling of 55001031440 in words is "fifty-five billion, one million, thirty-one thousand, four hundred forty".