661118570 has 32 divisors (see below), whose sum is σ = 1361035008. Its totient is φ = 226499328.

The previous prime is 661118569. The next prime is 661118573. The reversal of 661118570 is 75811166.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 661118570.

It is not an unprimeable number, because it can be changed into a prime (661118573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122162 + ... + 127458.

It is an arithmetic number, because the mean of its divisors is an integer number (42532344).

Almost surely, 2^661118570 is an apocalyptic number.

661118570 is an abundant number, since it is smaller than the sum of its proper divisors (699916438).

661118570 is a wasteful number, since it uses less digits than its factorization.

661118570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7094.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 661118570 is about 25712.2260802133. The cubic root of 661118570 is about 871.1503565473.

The spelling of 661118570 in words is "six hundred sixty-one million, one hundred eighteen thousand, five hundred seventy".