55383687440 has 40 divisors (see below), whose sum is σ = 129750052608. Its totient is φ = 21984360320.

The previous prime is 55383687421. The next prime is 55383687451. The reversal of 55383687440 is 4478638355.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×55383687440² (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 7 ways as a sum of consecutive naturals, for example, 2631872 + ... + 2652831.

Almost surely, 2^55383687440 is an apocalyptic number.

It is an amenable number.

55383687440 is an abundant number, since it is smaller than the sum of its proper divisors (74366365168).

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

55383687440 is a wasteful number, since it uses less digits than its factorization.

55383687440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5284847 (or 5284841 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 53.

The spelling of 55383687440 in words is "fifty-five billion, three hundred eighty-three million, six hundred eighty-seven thousand, four hundred forty".