1455591661 has 4 divisors (see below), whose sum is σ = 1476093024. Its totient is φ = 1435090300.

The previous prime is 1455591659. The next prime is 1455591671. The reversal of 1455591661 is 1661955541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1661955541 = 41 ⋅40535501.

It is a cyclic number.

It is not a de Polignac number, because 1455591661 - 2¹ = 1455591659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1455591601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10250575 + ... + 10250716.

It is an arithmetic number, because the mean of its divisors is an integer number (369023256).

Almost surely, 2^1455591661 is an apocalyptic number.

It is an amenable number.

1455591661 is a deficient number, since it is larger than the sum of its proper divisors (20501363).

1455591661 is an equidigital number, since it uses as much as digits as its factorization.

1455591661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20501362.

The product of its digits is 162000, while the sum is 43.

The square root of 1455591661 is about 38152.2169866969. The cubic root of 1455591661 is about 1133.3042557611.

The spelling of 1455591661 in words is "one billion, four hundred fifty-five million, five hundred ninety-one thousand, six hundred sixty-one".