61641288989208 has 80 divisors (see below), whose sum is σ = 172653807161880. Its totient is φ = 20546962716672.

The previous prime is 61641288989191. The next prime is 61641288989237. The reversal of 61641288989208 is 80298988214616.

61641288989208 is a `hidden beast` number, since 6 + 1 + 64 + 1 + 288 + 9 + 89 + 208 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 185267416 + ... + 185599832.

Almost surely, 2^{61641288989208} is an apocalyptic number.

It is an amenable number.

61641288989208 is an abundant number, since it is smaller than the sum of its proper divisors (111012518172672).

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

61641288989208 is a wasteful number, since it uses less digits than its factorization.

61641288989208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618598 (or 618585 counting only the distinct ones).

The product of its (nonzero) digits is 191102976, while the sum is 72.

The spelling of 61641288989208 in words is "sixty-one trillion, six hundred forty-one billion, two hundred eighty-eight million, nine hundred eighty-nine thousand, two hundred eight".