55405507906649 has 4 divisors (see below), whose sum is σ = 55442868331536. Its totient is φ = 55368147481764.

The previous prime is 55405507906613. The next prime is 55405507906757. The reversal of 55405507906649 is 94660970550455.

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 a cyclic number.

It is not a de Polignac number, because 55405507906649 - 2⁸ = 55405507906393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55405507956649) 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, 18680210219 + ... + 18680213184.

It is an arithmetic number, because the mean of its divisors is an integer number (13860717082884).

Almost surely, 2^{55405507906649} is an apocalyptic number.

It is an amenable number.

55405507906649 is a deficient number, since it is larger than the sum of its proper divisors (37360424887).

55405507906649 is a wasteful number, since it uses less digits than its factorization.

55405507906649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37360424886.

The product of its (nonzero) digits is 204120000, while the sum is 65.

The spelling of 55405507906649 in words is "fifty-five trillion, four hundred five billion, five hundred seven million, nine hundred six thousand, six hundred forty-nine".