1661504242 has 8 divisors (see below), whose sum is σ = 2492430300. Its totient is φ = 830694144.

The previous prime is 1661504171. The next prime is 1661504249. The reversal of 1661504242 is 2424051661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1656571401 + 4932841 = 40701^2 + 2221^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1661504249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35734 + ... + 67822.

Almost surely, 2^1661504242 is an apocalyptic number.

1661504242 is a deficient number, since it is larger than the sum of its proper divisors (830926058).

1661504242 is a wasteful number, since it uses less digits than its factorization.

1661504242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57980.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1661504242 is about 40761.5534787378. The cubic root of 1661504242 is about 1184.4056891559.

The spelling of 1661504242 in words is "one billion, six hundred sixty-one million, five hundred four thousand, two hundred forty-two".