1551015666 has 24 divisors (see below), whose sum is σ = 3364187580. Its totient is φ = 516443136.

The previous prime is 1551015647. The next prime is 1551015667. The reversal of 1551015666 is 6665101551.

It can be written as a sum of positive squares in 2 ways, for example, as 1319215041 + 231800625 = 36321^2 + 15225^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1551015666.

It is not an unprimeable number, because it can be changed into a prime (1551015667) 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, 29655 + ... + 63098.

Almost surely, 2^1551015666 is an apocalyptic number.

1551015666 is an abundant number, since it is smaller than the sum of its proper divisors (1813171914).

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

1551015666 is a wasteful number, since it uses less digits than its factorization.

1551015666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93690 (or 93687 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1551015666 is about 39382.9362287781. The cubic root of 1551015666 is about 1157.5472515763.

The spelling of 1551015666 in words is "one billion, five hundred fifty-one million, fifteen thousand, six hundred sixty-six".