1505500661 has 8 divisors (see below), whose sum is σ = 1722700224. Its totient is φ = 1288833120.

The previous prime is 1505500643. The next prime is 1505500687. The reversal of 1505500661 is 1660055051.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1505500661 - 2⁶ = 1505500597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1505500561) 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 7 ways as a sum of consecutive naturals, for example, 126920 + ... + 138273.

It is an arithmetic number, because the mean of its divisors is an integer number (215337528).

Almost surely, 2^1505500661 is an apocalyptic number.

It is an amenable number.

1505500661 is a deficient number, since it is larger than the sum of its proper divisors (217199563).

1505500661 is an equidigital number, since it uses as much as digits as its factorization.

1505500661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266011.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 1505500661 is about 38800.7817060430. The cubic root of 1505500661 is about 1146.1117989443. Note that the first 3 decimals are identical.

The spelling of 1505500661 in words is "one billion, five hundred five million, five hundred thousand, six hundred sixty-one".