61101666440 has 32 divisors (see below), whose sum is σ = 137638872000. Its totient is φ = 24412200384.

The previous prime is 61101666403. The next prime is 61101666463. The reversal of 61101666440 is 4466610116.

It is a self number, because there is not a number n which added to its sum of digits gives 61101666440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 854780 + ... + 923499.

It is an arithmetic number, because the mean of its divisors is an integer number (4301214750).

Almost surely, 2^61101666440 is an apocalyptic number.

It is an amenable number.

61101666440 is an abundant number, since it is smaller than the sum of its proper divisors (76537205560).

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

61101666440 is a wasteful number, since it uses less digits than its factorization.

61101666440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779149 (or 1779145 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 61101666440 in words is "sixty-one billion, one hundred one million, six hundred sixty-six thousand, four hundred forty".