1423505661 has 16 divisors (see below), whose sum is σ = 1932053760. Its totient is φ = 932106240.

The previous prime is 1423505639. The next prime is 1423505663. The reversal of 1423505661 is 1665053241.

It is not a de Polignac number, because 1423505661 - 2¹⁵ = 1423472893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423505663) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 30181 + ... + 61301.

It is an arithmetic number, because the mean of its divisors is an integer number (120753360).

Almost surely, 2^1423505661 is an apocalyptic number.

It is an amenable number.

1423505661 is a deficient number, since it is larger than the sum of its proper divisors (508548099).

1423505661 is a wasteful number, since it uses less digits than its factorization.

1423505661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31396.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1423505661 is about 37729.3739810244. The cubic root of 1423505661 is about 1124.9150647976.

The spelling of 1423505661 in words is "one billion, four hundred twenty-three million, five hundred five thousand, six hundred sixty-one".