7545574521 has 12 divisors (see below), whose sum is σ = 11302836272. Its totient is φ = 5030382852.

The previous prime is 7545574493. The next prime is 7545574529. The reversal of 7545574521 is 1254755457.

7545574521 is a `hidden beast` number, since 7 + 5 + 4 + 55 + 74 + 521 = 666.

It is not a de Polignac number, because 7545574521 - 2¹⁷ = 7545443449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7545574529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15525631 + ... + 15526116.

Almost surely, 2^7545574521 is an apocalyptic number.

It is an amenable number.

7545574521 is a deficient number, since it is larger than the sum of its proper divisors (3757261751).

7545574521 is an equidigital number, since it uses as much as digits as its factorization.

7545574521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31051762 (or 31051750 counting only the distinct ones).

The product of its digits is 980000, while the sum is 45.

The square root of 7545574521 is about 86865.2664820640. The cubic root of 7545574521 is about 1961.3906659269.

The spelling of 7545574521 in words is "seven billion, five hundred forty-five million, five hundred seventy-four thousand, five hundred twenty-one".