1661521044146 has 8 divisors (see below), whose sum is σ = 2499341855004. Its totient is φ = 828407092480.

The previous prime is 1661521044089. The next prime is 1661521044163. The reversal of 1661521044146 is 6414401251661.

It can be written as a sum of positive squares in 2 ways, for example, as 1615667245921 + 45853798225 = 1271089^2 + 214135^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1176713915 + ... + 1176715326.

Almost surely, 2^{1661521044146} is an apocalyptic number.

1661521044146 is a deficient number, since it is larger than the sum of its proper divisors (837820810858).

1661521044146 is a wasteful number, since it uses less digits than its factorization.

1661521044146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353429596.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 1661521044146 in words is "one trillion, six hundred sixty-one billion, five hundred twenty-one million, forty-four thousand, one hundred forty-six".