55441444401561 has 4 divisors (see below), whose sum is σ = 73921925868752. Its totient is φ = 36960962934372.

The previous prime is 55441444401557. The next prime is 55441444401649. The reversal of 55441444401561 is 16510444414455.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 55441444401561 - 2² = 55441444401557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55441444401561.

It is not an unprimeable number, because it can be changed into a prime (55441444401061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9240240733591 + ... + 9240240733596.

It is an arithmetic number, because the mean of its divisors is an integer number (18480481467188).

Almost surely, 2^{55441444401561} is an apocalyptic number.

It is an amenable number.

55441444401561 is a deficient number, since it is larger than the sum of its proper divisors (18480481467191).

55441444401561 is a wasteful number, since it uses less digits than its factorization.

55441444401561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18480481467190.

The product of its (nonzero) digits is 3072000, while the sum is 48.

The spelling of 55441444401561 in words is "fifty-five trillion, four hundred forty-one billion, four hundred forty-four million, four hundred one thousand, five hundred sixty-one".