1661506611074 has 16 divisors (see below), whose sum is σ = 2572687792896. Its totient is φ = 803944688400.

The previous prime is 1661506611053. The next prime is 1661506611109. The reversal of 1661506611074 is 4701166051661.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7822964 + ... + 8032544.

It is an arithmetic number, because the mean of its divisors is an integer number (160792987056).

Almost surely, 2^{1661506611074} is an apocalyptic number.

1661506611074 is a deficient number, since it is larger than the sum of its proper divisors (911181181822).

1661506611074 is a wasteful number, since it uses less digits than its factorization.

1661506611074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337481.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 1661506611074 in words is "one trillion, six hundred sixty-one billion, five hundred six million, six hundred eleven thousand, seventy-four".