1655968695561 has 12 divisors (see below), whose sum is σ = 2420773515888. Its totient is φ = 1090678176504.

The previous prime is 1655968695541. The next prime is 1655968695581.

1655968695561 is a `hidden beast` number, since 1 + 6 + 5 + 5 + 9 + 6 + 8 + 69 + 556 + 1 = 666.

1655968695561 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (1655968695541) and next prime (1655968695581).

It is not a de Polignac number, because 1655968695561 - 2⁵ = 1655968695529 is a prime.

It is a super-2 number, since 2×1655968695561² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1655968695561.

It is not an unprimeable number, because it can be changed into a prime (1655968695541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1108412035 + ... + 1108413528.

It is an arithmetic number, because the mean of its divisors is an integer number (201731126324).

Almost surely, 2^{1655968695561} is an apocalyptic number.

It is an amenable number.

1655968695561 is a deficient number, since it is larger than the sum of its proper divisors (764804820327).

1655968695561 is a wasteful number, since it uses less digits than its factorization.

1655968695561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216825652 (or 2216825649 counting only the distinct ones).

The product of its digits is 524880000, while the sum is 72.

The spelling of 1655968695561 in words is "one trillion, six hundred fifty-five billion, nine hundred sixty-eight million, six hundred ninety-five thousand, five hundred sixty-one".