1516670065661 has 8 divisors (see below), whose sum is σ = 1553817665400. Its totient is φ = 1479529877760.

The previous prime is 1516670065613. The next prime is 1516670065697. The reversal of 1516670065661 is 1665600766151.

It can be written as a sum of positive squares in 4 ways, for example, as 297123108100 + 1219546957561 = 545090^2 + 1104331^2 .

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 1516670065661 - 2⁶ = 1516670065597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1516670065061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1437566 + ... + 2258303.

It is an arithmetic number, because the mean of its divisors is an integer number (194227208175).

Almost surely, 2^{1516670065661} is an apocalyptic number.

It is an amenable number.

1516670065661 is a deficient number, since it is larger than the sum of its proper divisors (37147599739).

1516670065661 is a wasteful number, since it uses less digits than its factorization.

1516670065661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3705919.

The product of its (nonzero) digits is 1360800, while the sum is 50.

The spelling of 1516670065661 in words is "one trillion, five hundred sixteen billion, six hundred seventy million, sixty-five thousand, six hundred sixty-one".