205110061660 has 96 divisors (see below), whose sum is σ = 507100220928. Its totient is φ = 68215530240.

The previous prime is 205110061633. The next prime is 205110061661. The reversal of 205110061660 is 66160011502.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205110061661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1654767 + ... + 1774393.

It is an arithmetic number, because the mean of its divisors is an integer number (5282293968).

Almost surely, 2^205110061660 is an apocalyptic number.

205110061660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205110061660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253550110464).

205110061660 is an abundant number, since it is smaller than the sum of its proper divisors (301990159268).

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

205110061660 is a wasteful number, since it uses less digits than its factorization.

205110061660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120011 (or 120009 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 205110061660 in words is "two hundred five billion, one hundred ten million, sixty-one thousand, six hundred sixty".