61660505020 has 12 divisors (see below), whose sum is σ = 129487060584. Its totient is φ = 24664202000.

The previous prime is 61660505009. The next prime is 61660505021. The reversal of 61660505020 is 2050506616.

61660505020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61660505021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1541512606 + ... + 1541512645.

It is an arithmetic number, because the mean of its divisors is an integer number (10790588382).

Almost surely, 2^61660505020 is an apocalyptic number.

It is an amenable number.

61660505020 is an abundant number, since it is smaller than the sum of its proper divisors (67826555564).

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

61660505020 is a wasteful number, since it uses less digits than its factorization.

61660505020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3083025260 (or 3083025258 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 61660505020 in words is "sixty-one billion, six hundred sixty million, five hundred five thousand, twenty".