1051615665 has 96 divisors (see below), whose sum is σ = 2022467616. Its totient is φ = 503193600.

The previous prime is 1051615657. The next prime is 1051615679. The reversal of 1051615665 is 5665161501.

It can be written as a sum of positive squares in 16 ways, for example, as 54066609 + 997549056 = 7353^2 + 31584^2 .

It is not a de Polignac number, because 1051615665 - 2³ = 1051615657 is a prime.

It is a super-2 number, since 2×1051615665² = 2211791013746784450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1499815 + ... + 1500515.

It is an arithmetic number, because the mean of its divisors is an integer number (21067371).

Almost surely, 2^1051615665 is an apocalyptic number.

1051615665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1051615665 is a deficient number, since it is larger than the sum of its proper divisors (970851951).

1051615665 is a wasteful number, since it uses less digits than its factorization.

1051615665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819 (or 816 counting only the distinct ones).

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

The square root of 1051615665 is about 32428.6241613794. The cubic root of 1051615665 is about 1016.9174090249.

The spelling of 1051615665 in words is "one billion, fifty-one million, six hundred fifteen thousand, six hundred sixty-five".