2661521660363 has 8 divisors (see below), whose sum is σ = 2689708230720. Its totient is φ = 2633396433480.

The previous prime is 2661521660297. The next prime is 2661521660383. The reversal of 2661521660363 is 3630661251662.

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 2661521660363 - 2¹⁸ = 2661521398219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661521660383) 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, 15248633 + ... + 15422186.

It is an arithmetic number, because the mean of its divisors is an integer number (336213528840).

Almost surely, 2^{2661521660363} is an apocalyptic number.

2661521660363 is a deficient number, since it is larger than the sum of its proper divisors (28186570357).

2661521660363 is a wasteful number, since it uses less digits than its factorization.

2661521660363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30671737.

The product of its (nonzero) digits is 1399680, while the sum is 47.

The spelling of 2661521660363 in words is "two trillion, six hundred sixty-one billion, five hundred twenty-one million, six hundred sixty thousand, three hundred sixty-three".