660155705650 has 48 divisors (see below), whose sum is σ = 1451692175040. Its totient is φ = 218534299200.

The previous prime is 660155705647. The next prime is 660155705659. The reversal of 660155705650 is 56507551066.

It is a self number, because there is not a number n which added to its sum of digits gives 660155705650.

It is not an unprimeable number, because it can be changed into a prime (660155705659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32509836 + ... + 32530135.

It is an arithmetic number, because the mean of its divisors is an integer number (30243586980).

Almost surely, 2^660155705650 is an apocalyptic number.

660155705650 is an abundant number, since it is smaller than the sum of its proper divisors (791536469390).

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

660155705650 is a wasteful number, since it uses less digits than its factorization.

660155705650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65040019 (or 65040014 counting only the distinct ones).

The product of its (nonzero) digits is 945000, while the sum is 46.

The spelling of 660155705650 in words is "six hundred sixty billion, one hundred fifty-five million, seven hundred five thousand, six hundred fifty".