1461623661 has 6 divisors (see below), whose sum is σ = 2111234190. Its totient is φ = 974415768.

The previous prime is 1461623651. The next prime is 1461623687. The reversal of 1461623661 is 1663261641.

It is a happy number.

1461623661 is a `hidden beast` number, since 1 + 4 + 616 + 2 + 36 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1434061161 + 27562500 = 37869^2 + 5250^2 .

It is not a de Polignac number, because 1461623661 - 2⁷ = 1461623533 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1461623641) 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 5 ways as a sum of consecutive naturals, for example, 81201306 + ... + 81201323.

It is an arithmetic number, because the mean of its divisors is an integer number (351872365).

Almost surely, 2^1461623661 is an apocalyptic number.

It is an amenable number.

1461623661 is a deficient number, since it is larger than the sum of its proper divisors (649610529).

1461623661 is a wasteful number, since it uses less digits than its factorization.

1461623661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162402635 (or 162402632 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 1461623661 is about 38231.1870205465. The cubic root of 1461623661 is about 1134.8675765213.

The spelling of 1461623661 in words is "one billion, four hundred sixty-one million, six hundred twenty-three thousand, six hundred sixty-one".