61665021505740 has 48 divisors (see below), whose sum is σ = 182818651996512. Its totient is φ = 15476711279616.

The previous prime is 61665021505733. The next prime is 61665021505741. The reversal of 61665021505740 is 4750512056616.

It is a self number, because there is not a number n which added to its sum of digits gives 61665021505740.

It is not an unprimeable number, because it can be changed into a prime (61665021505741) 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, 30227950699 + ... + 30227952738.

It is an arithmetic number, because the mean of its divisors is an integer number (3808721916594).

Almost surely, 2^{61665021505740} is an apocalyptic number.

61665021505740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61665021505740 is an abundant number, since it is smaller than the sum of its proper divisors (121153630490772).

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

61665021505740 is a wasteful number, since it uses less digits than its factorization.

61665021505740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60455903466 (or 60455903464 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 48.

The spelling of 61665021505740 in words is "sixty-one trillion, six hundred sixty-five billion, twenty-one million, five hundred five thousand, seven hundred forty".