2661593332981 has 8 divisors (see below), whose sum is σ = 2997219472128. Its totient is φ = 2341577712000.

The previous prime is 2661593332973. The next prime is 2661593332987. The reversal of 2661593332981 is 1892333951662.

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 2661593332981 - 2³ = 2661593332973 is a prime.

It is a super-2 number, since 2×2661593332981² (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 (2661593332987) 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, 3902629180 + ... + 3902629861.

It is an arithmetic number, because the mean of its divisors is an integer number (374652434016).

Almost surely, 2^{2661593332981} is an apocalyptic number.

It is an amenable number.

2661593332981 is a deficient number, since it is larger than the sum of its proper divisors (335626139147).

2661593332981 is a wasteful number, since it uses less digits than its factorization.

2661593332981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7805259083.

The product of its digits is 12597120, while the sum is 58.

The spelling of 2661593332981 in words is "two trillion, six hundred sixty-one billion, five hundred ninety-three million, three hundred thirty-two thousand, nine hundred eighty-one".