661206006612 has 96 divisors (see below), whose sum is σ = 1819088409600. Its totient is φ = 207246051936.

The previous prime is 661206006583. The next prime is 661206006661. The reversal of 661206006612 is 216600602166.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2109258 + ... + 2402369.

It is an arithmetic number, because the mean of its divisors is an integer number (18948837600).

Almost surely, 2^661206006612 is an apocalyptic number.

It is an amenable number.

661206006612 is an abundant number, since it is smaller than the sum of its proper divisors (1157882402988).

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

661206006612 is a wasteful number, since it uses less digits than its factorization.

661206006612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511722 (or 4511714 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

Adding to 661206006612 its reverse (216600602166), we get a palindrome (877806608778).

The spelling of 661206006612 in words is "six hundred sixty-one billion, two hundred six million, six thousand, six hundred twelve".