61665107320 has 64 divisors (see below), whose sum is σ = 141751969920. Its totient is φ = 24132132864.

The previous prime is 61665107303. The next prime is 61665107327. The reversal of 61665107320 is 2370156616.

It is a self number, because there is not a number n which added to its sum of digits gives 61665107320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61665107327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7239384 + ... + 7247896.

It is an arithmetic number, because the mean of its divisors is an integer number (2214874530).

Almost surely, 2^61665107320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61665107320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70875984960).

61665107320 is an abundant number, since it is smaller than the sum of its proper divisors (80086862600).

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

61665107320 is a wasteful number, since it uses less digits than its factorization.

61665107320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12424 (or 12420 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 61665107320 in words is "sixty-one billion, six hundred sixty-five million, one hundred seven thousand, three hundred twenty".