661302125562440 has 32 divisors (see below), whose sum is σ = 1487933258417280. Its totient is φ = 264520232286912.

The previous prime is 661302125562413. The next prime is 661302125562521. The reversal of 661302125562440 is 44265521203166.

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, 1777184 + ... + 36411023.

It is an arithmetic number, because the mean of its divisors is an integer number (46497914325540).

Almost surely, 2^{661302125562440} is an apocalyptic number.

It is an amenable number.

661302125562440 is an abundant number, since it is smaller than the sum of its proper divisors (826631132854840).

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

661302125562440 is a wasteful number, since it uses less digits than its factorization.

661302125562440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38621141 (or 38621137 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 47.

The spelling of 661302125562440 in words is "six hundred sixty-one trillion, three hundred two billion, one hundred twenty-five million, five hundred sixty-two thousand, four hundred forty".