1661315034145 has 8 divisors (see below), whose sum is σ = 2146930198056. Its totient is φ = 1226817255936.

The previous prime is 1661315034101. The next prime is 1661315034161. The reversal of 1661315034145 is 5414305131661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 74236631296 + 1587078402849 = 272464^2 + 1259793^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1661315034145 - 2²⁵ = 1661281479713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1661315034098 and 1661315034107.

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, 12779346352 + ... + 12779346481.

It is an arithmetic number, because the mean of its divisors is an integer number (268366274757).

Almost surely, 2^{1661315034145} is an apocalyptic number.

It is an amenable number.

1661315034145 is a deficient number, since it is larger than the sum of its proper divisors (485615163911).

1661315034145 is a wasteful number, since it uses less digits than its factorization.

1661315034145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25558692851.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 1661315034145 in words is "one trillion, six hundred sixty-one billion, three hundred fifteen million, thirty-four thousand, one hundred forty-five".