2686566018581 has 4 divisors (see below), whose sum is σ = 2686714934592. Its totient is φ = 2686417102572.

The previous prime is 2686566018547. The next prime is 2686566018601. The reversal of 2686566018581 is 1858106656862.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2686566018581 is a prime.

It is a super-2 number, since 2×2686566018581² (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 (2686566018511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74430941 + ... + 74467026.

It is an arithmetic number, because the mean of its divisors is an integer number (671678733648).

Almost surely, 2^{2686566018581} is an apocalyptic number.

It is an amenable number.

2686566018581 is a deficient number, since it is larger than the sum of its proper divisors (148916011).

2686566018581 is a wasteful number, since it uses less digits than its factorization.

2686566018581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148916010.

The product of its (nonzero) digits is 33177600, while the sum is 62.

The spelling of 2686566018581 in words is "two trillion, six hundred eighty-six billion, five hundred sixty-six million, eighteen thousand, five hundred eighty-one".