65661205000 has 80 divisors (see below), whose sum is σ = 160533362880. Its totient is φ = 25122504000.

The previous prime is 65661204943. The next prime is 65661205009. The reversal of 65661205000 is 50216656.

65661205000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×65661205000² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65661205009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 170484 + ... + 400483.

It is an arithmetic number, because the mean of its divisors is an integer number (2006667036).

Almost surely, 2^65661205000 is an apocalyptic number.

It is an amenable number.

65661205000 is an abundant number, since it is smaller than the sum of its proper divisors (94872157880).

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

65661205000 is a wasteful number, since it uses less digits than its factorization.

65661205000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571016 (or 570997 counting only the distinct ones).

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

The spelling of 65661205000 in words is "sixty-five billion, six hundred sixty-one million, two hundred five thousand".