1655360635561 has 4 divisors (see below), whose sum is σ = 1752734790612. Its totient is φ = 1557986480512.

The previous prime is 1655360635553. The next prime is 1655360635571.

1655360635561 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 924068851225 + 731291784336 = 961285^2 + 855156^2 .

It is a cyclic number.

It is not a de Polignac number, because 1655360635561 - 2³ = 1655360635553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1655360635499 and 1655360635508.

It is not an unprimeable number, because it can be changed into a prime (1655360635501) 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 3 ways as a sum of consecutive naturals, for example, 48687077500 + ... + 48687077533.

It is an arithmetic number, because the mean of its divisors is an integer number (438183697653).

Almost surely, 2^{1655360635561} is an apocalyptic number.

It is an amenable number.

1655360635561 is a deficient number, since it is larger than the sum of its proper divisors (97374155051).

1655360635561 is an equidigital number, since it uses as much as digits as its factorization.

1655360635561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97374155050.

The product of its (nonzero) digits is 7290000, while the sum is 52.

The spelling of 1655360635561 in words is "one trillion, six hundred fifty-five billion, three hundred sixty million, six hundred thirty-five thousand, five hundred sixty-one".