1661506611076 has 12 divisors (see below), whose sum is σ = 3131300920972. Its totient is φ = 766849205088.

The previous prime is 1661506611053. The next prime is 1661506611109. The reversal of 1661506611076 is 6701166051661.

It can be written as a sum of positive squares in 2 ways, for example, as 926937626176 + 734568984900 = 962776^2 + 857070^2 .

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, 15976025055 + ... + 15976025158.

Almost surely, 2^{1661506611076} is an apocalyptic number.

It is an amenable number.

1661506611076 is a deficient number, since it is larger than the sum of its proper divisors (1469794309896).

1661506611076 is a wasteful number, since it uses less digits than its factorization.

1661506611076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31952050230 (or 31952050228 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 1661506611076 in words is "one trillion, six hundred sixty-one billion, five hundred six million, six hundred eleven thousand, seventy-six".