6550807881 has 4 divisors (see below), whose sum is σ = 8734410512. Its totient is φ = 4367205252.

The previous prime is 6550807807. The next prime is 6550807903. The reversal of 6550807881 is 1887080556.

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 6550807881 - 2⁹ = 6550807369 is a prime.

It is a super-2 number, since 2×6550807881² = 85826167787543420322, which contains 22 as substring.

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 6550807881.

It is not an unprimeable number, because it can be changed into a prime (6550807181) 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, 1091801311 + ... + 1091801316.

It is an arithmetic number, because the mean of its divisors is an integer number (2183602628).

Almost surely, 2^6550807881 is an apocalyptic number.

It is an amenable number.

6550807881 is a deficient number, since it is larger than the sum of its proper divisors (2183602631).

6550807881 is a wasteful number, since it uses less digits than its factorization.

6550807881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2183602630.

The product of its (nonzero) digits is 537600, while the sum is 48.

The square root of 6550807881 is about 80937.0612327875. The cubic root of 6550807881 is about 1871.1055528080.

The spelling of 6550807881 in words is "six billion, five hundred fifty million, eight hundred seven thousand, eight hundred eighty-one".