549778021640 has 32 divisors (see below), whose sum is σ = 1267171297560. Its totient is φ = 214547520000.

The previous prime is 549778021619. The next prime is 549778021673. The reversal of 549778021640 is 46120877945.

It can be written as a sum of positive squares in 4 ways, for example, as 458971020676 + 90807000964 = 677474^2 + 301342^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167613611 + ... + 167616890.

Almost surely, 2^549778021640 is an apocalyptic number.

It is an amenable number.

549778021640 is an abundant number, since it is smaller than the sum of its proper divisors (717393275920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

549778021640 is a wasteful number, since it uses less digits than its factorization.

549778021640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335230553 (or 335230549 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 549778021640 in words is "five hundred forty-nine billion, seven hundred seventy-eight million, twenty-one thousand, six hundred forty".