1661260330042 has 4 divisors (see below), whose sum is σ = 2491890495066. Its totient is φ = 830630165020.

The previous prime is 1661260330019. The next prime is 1661260330063. The reversal of 1661260330042 is 2400330621661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1267540474201 + 393719855841 = 1125851^2 + 627471^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415315082509 + ... + 415315082512.

Almost surely, 2^{1661260330042} is an apocalyptic number.

1661260330042 is a deficient number, since it is larger than the sum of its proper divisors (830630165024).

1661260330042 is an equidigital number, since it uses as much as digits as its factorization.

1661260330042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830630165023.

The product of its (nonzero) digits is 31104, while the sum is 34.

The spelling of 1661260330042 in words is "one trillion, six hundred sixty-one billion, two hundred sixty million, three hundred thirty thousand, forty-two".