1661746207318 has 16 divisors (see below), whose sum is σ = 2505404263824. Its totient is φ = 826619004000.

The previous prime is 1661746207271. The next prime is 1661746207339. The reversal of 1661746207318 is 8137026471661.

It is a happy number.

It is a super-2 number, since 2×1661746207318² (a number of 25 digits) contains 22 as substring.

It is a congruent 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, 1447005 + ... + 2327512.

It is an arithmetic number, because the mean of its divisors is an integer number (156587766489).

Almost surely, 2^{1661746207318} is an apocalyptic number.

1661746207318 is a deficient number, since it is larger than the sum of its proper divisors (843658056506).

1661746207318 is a wasteful number, since it uses less digits than its factorization.

1661746207318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3775647.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The spelling of 1661746207318 in words is "one trillion, six hundred sixty-one billion, seven hundred forty-six million, two hundred seven thousand, three hundred eighteen".