1665655555056 has 40 divisors (see below), whose sum is σ = 4307816722560. Its totient is φ = 554589717696.

The previous prime is 1665655555033. The next prime is 1665655555103. The reversal of 1665655555056 is 6505555565661.

It is a happy number.

It is a super-2 number, since 2×1665655555056² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19607196 + ... + 19691963.

It is an arithmetic number, because the mean of its divisors is an integer number (107695418064).

Almost surely, 2^{1665655555056} is an apocalyptic number.

1665655555056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1665655555056 is an abundant number, since it is smaller than the sum of its proper divisors (2642161167504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1665655555056 is a wasteful number, since it uses less digits than its factorization.

1665655555056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39300053 (or 39300047 counting only the distinct ones).

The product of its (nonzero) digits is 101250000, while the sum is 60.

The spelling of 1665655555056 in words is "one trillion, six hundred sixty-five billion, six hundred fifty-five million, five hundred fifty-five thousand, fifty-six".