1655155505081 has 4 divisors (see below), whose sum is σ = 1782475159332. Its totient is φ = 1527835850832.

The previous prime is 1655155505071. The next prime is 1655155505099. The reversal of 1655155505081 is 1805055515561.

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 822982809856 + 832172695225 = 907184^2 + 912235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1655155505081 is a prime.

It is a super-2 number, since 2×1655155505081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1655155505051) 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, 63659827106 + ... + 63659827131.

It is an arithmetic number, because the mean of its divisors is an integer number (445618789833).

Almost surely, 2^{1655155505081} is an apocalyptic number.

It is an amenable number.

1655155505081 is a deficient number, since it is larger than the sum of its proper divisors (127319654251).

1655155505081 is a wasteful number, since it uses less digits than its factorization.

1655155505081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127319654250.

The product of its (nonzero) digits is 750000, while the sum is 47.

The spelling of 1655155505081 in words is "one trillion, six hundred fifty-five billion, one hundred fifty-five million, five hundred five thousand, eighty-one".