1038671665 has 32 divisors (see below), whose sum is σ = 1298436480. Its totient is φ = 797121024.

The previous prime is 1038671653. The next prime is 1038671701. The reversal of 1038671665 is 5661768301.

It is a cyclic number.

It is not a de Polignac number, because 1038671665 - 2⁵ = 1038671633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5272347 + ... + 5272543.

It is an arithmetic number, because the mean of its divisors is an integer number (40576140).

Almost surely, 2^1038671665 is an apocalyptic number.

It is an amenable number.

1038671665 is a deficient number, since it is larger than the sum of its proper divisors (259764815).

1038671665 is a wasteful number, since it uses less digits than its factorization.

1038671665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 1038671665 is about 32228.4294528914. The cubic root of 1038671665 is about 1012.7278690502.

It can be divided in two parts, 103 and 8671665, that added together give a palindrome (8671768).

The spelling of 1038671665 in words is "one billion, thirty-eight million, six hundred seventy-one thousand, six hundred sixty-five".