661605210570 has 16 divisors (see below), whose sum is σ = 1587852505440. Its totient is φ = 176428056144.

The previous prime is 661605210547. The next prime is 661605210589. The reversal of 661605210570 is 75012506166.

661605210570 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 11026753480 + ... + 11026753539.

It is an arithmetic number, because the mean of its divisors is an integer number (99240781590).

Almost surely, 2^661605210570 is an apocalyptic number.

661605210570 is an abundant number, since it is smaller than the sum of its proper divisors (926247294870).

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

661605210570 is a wasteful number, since it uses less digits than its factorization.

661605210570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22053507029.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 661605210570 in words is "six hundred sixty-one billion, six hundred five million, two hundred ten thousand, five hundred seventy".