2661204165533 has 8 divisors (see below), whose sum is σ = 2684834304768. Its totient is φ = 2637575424064.

The previous prime is 2661204165461. The next prime is 2661204165539. The reversal of 2661204165533 is 3355614021662.

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 2661204165533 - 2¹⁶ = 2661204099997 is a prime.

It is a super-2 number, since 2×2661204165533² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661204165539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3680660 + ... + 4343922.

It is an arithmetic number, because the mean of its divisors is an integer number (335604288096).

Almost surely, 2^{2661204165533} is an apocalyptic number.

It is an amenable number.

2661204165533 is a deficient number, since it is larger than the sum of its proper divisors (23630139235).

2661204165533 is a wasteful number, since it uses less digits than its factorization.

2661204165533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698883.

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 2661204165533 in words is "two trillion, six hundred sixty-one billion, two hundred four million, one hundred sixty-five thousand, five hundred thirty-three".