4551021540 has 72 divisors (see below), whose sum is σ = 14866678008. Its totient is φ = 1120250880.

The previous prime is 4551021539. The next prime is 4551021577. The reversal of 4551021540 is 451201554.

It can be written as a sum of positive squares in 4 ways, for example, as 851705856 + 3699315684 = 29184^2 + 60822^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 970101 + ... + 974780.

It is an arithmetic number, because the mean of its divisors is an integer number (206481639).

Almost surely, 2^4551021540 is an apocalyptic number.

It is an amenable number.

4551021540 is an abundant number, since it is smaller than the sum of its proper divisors (10315656468).

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

4551021540 is a wasteful number, since it uses less digits than its factorization.

4551021540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1944909 (or 1944904 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 4551021540 is about 67461.2595494629. The cubic root of 4551021540 is about 1657.1797979634.

The spelling of 4551021540 in words is "four billion, five hundred fifty-one million, twenty-one thousand, five hundred forty".