1525536666 has 40 divisors (see below), whose sum is σ = 3421212564. Its totient is φ = 508083840.

The previous prime is 1525536643. The next prime is 1525536679. The reversal of 1525536666 is 6666355251.

It can be written as a sum of positive squares in 2 ways, for example, as 1046846025 + 478690641 = 32355^2 + 21879^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 232146 + ... + 238626.

Almost surely, 2^1525536666 is an apocalyptic number.

1525536666 is an abundant number, since it is smaller than the sum of its proper divisors (1895675898).

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

1525536666 is a wasteful number, since it uses less digits than its factorization.

1525536666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7948 (or 7939 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The square root of 1525536666 is about 39058.1190791364. The cubic root of 1525536666 is about 1151.1737646470.

The spelling of 1525536666 in words is "one billion, five hundred twenty-five million, five hundred thirty-six thousand, six hundred sixty-six".