55840400815 has 4 divisors (see below), whose sum is σ = 67008480984. Its totient is φ = 44672320648.

The previous prime is 55840400809. The next prime is 55840400821. The reversal of 55840400815 is 51800404855.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (55840400809) and next prime (55840400821).

It is a cyclic number.

It is not a de Polignac number, because 55840400815 - 2¹³ = 55840392623 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5584040077 + ... + 5584040086.

It is an arithmetic number, because the mean of its divisors is an integer number (16752120246).

Almost surely, 2^55840400815 is an apocalyptic number.

55840400815 is a deficient number, since it is larger than the sum of its proper divisors (11168080169).

55840400815 is a wasteful number, since it uses less digits than its factorization.

55840400815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11168080168.

The product of its (nonzero) digits is 128000, while the sum is 40.

The spelling of 55840400815 in words is "fifty-five billion, eight hundred forty million, four hundred thousand, eight hundred fifteen".