720106661655 has 48 divisors (see below), whose sum is σ = 1293520531680. Its totient is φ = 370154529024.

The previous prime is 720106661623. The next prime is 720106661663. The reversal of 720106661655 is 556166601027.

It is not a de Polignac number, because 720106661655 - 2⁵ = 720106661623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 720106661655.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 244657 + ... + 1224773.

It is an arithmetic number, because the mean of its divisors is an integer number (26948344410).

Almost surely, 2^720106661655 is an apocalyptic number.

720106661655 is a deficient number, since it is larger than the sum of its proper divisors (573413870025).

720106661655 is a wasteful number, since it uses less digits than its factorization.

720106661655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980720 (or 980717 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 720106661655 in words is "seven hundred twenty billion, one hundred six million, six hundred sixty-one thousand, six hundred fifty-five".