549521021641 has 4 divisors (see below), whose sum is σ = 549566035984. Its totient is φ = 549476007300.

The previous prime is 549521021633. The next prime is 549521021723. The reversal of 549521021641 is 146120125945.

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 549521021641 - 2³ = 549521021633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 549521021594 and 549521021603.

It is not an unprimeable number, because it can be changed into a prime (549521024641) 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, 22488855 + ... + 22513276.

It is an arithmetic number, because the mean of its divisors is an integer number (137391508996).

Almost surely, 2^549521021641 is an apocalyptic number.

It is an amenable number.

549521021641 is a deficient number, since it is larger than the sum of its proper divisors (45014343).

549521021641 is a wasteful number, since it uses less digits than its factorization.

549521021641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45014342.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 549521021641 in words is "five hundred forty-nine billion, five hundred twenty-one million, twenty-one thousand, six hundred forty-one".