549521021642 has 16 divisors (see below), whose sum is σ = 824840607240. Its totient is φ = 274574220288.

The previous prime is 549521021633. The next prime is 549521021723. The reversal of 549521021642 is 246120125945.

It can be written as a sum of positive squares in 4 ways, for example, as 541550281801 + 7970739841 = 735901^2 + 89279^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 549521021642.

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, 20014748 + ... + 20042184.

Almost surely, 2^549521021642 is an apocalyptic number.

549521021642 is a deficient number, since it is larger than the sum of its proper divisors (275319585598).

549521021642 is a wasteful number, since it uses less digits than its factorization.

549521021642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33865.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 549521021642 in words is "five hundred forty-nine billion, five hundred twenty-one million, twenty-one thousand, six hundred forty-two".