1491665567 has 16 divisors (see below), whose sum is σ = 1748174400. Its totient is φ = 1246076160.

The previous prime is 1491665557. The next prime is 1491665627. The reversal of 1491665567 is 7655661941.

It is not a de Polignac number, because 1491665567 - 2¹⁰ = 1491664543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491665557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 350609 + ... + 354837.

It is an arithmetic number, because the mean of its divisors is an integer number (109260900).

Almost surely, 2^1491665567 is an apocalyptic number.

1491665567 is a deficient number, since it is larger than the sum of its proper divisors (256508833).

1491665567 is a wasteful number, since it uses less digits than its factorization.

1491665567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5506.

The product of its digits is 1360800, while the sum is 50.

The square root of 1491665567 is about 38622.0865179498. The cubic root of 1491665567 is about 1142.5901827952.

The spelling of 1491665567 in words is "one billion, four hundred ninety-one million, six hundred sixty-five thousand, five hundred sixty-seven".