1623264661 has 4 divisors (see below), whose sum is σ = 1662856524. Its totient is φ = 1583672800.

The previous prime is 1623264659. The next prime is 1623264679. The reversal of 1623264661 is 1664623261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1664623261 = 7 ⋅237803323.

It can be written as a sum of positive squares in 2 ways, for example, as 554367025 + 1068897636 = 23545^2 + 32694^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623264661 - 2¹ = 1623264659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1623264661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623264641) 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, 19795870 + ... + 19795951.

It is an arithmetic number, because the mean of its divisors is an integer number (415714131).

Almost surely, 2^1623264661 is an apocalyptic number.

It is an amenable number.

1623264661 is a deficient number, since it is larger than the sum of its proper divisors (39591863).

1623264661 is an equidigital number, since it uses as much as digits as its factorization.

1623264661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39591862.

The product of its digits is 62208, while the sum is 37.

The square root of 1623264661 is about 40289.7587607571. The cubic root of 1623264661 is about 1175.2486960530.

The spelling of 1623264661 in words is "one billion, six hundred twenty-three million, two hundred sixty-four thousand, six hundred sixty-one".