661551050010 has 32 divisors (see below), whose sum is σ = 1590542671680. Its totient is φ = 176100263168.

The previous prime is 661551049987. The next prime is 661551050021. The reversal of 661551050010 is 10050155166.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a self number, because there is not a number n which added to its sum of digits gives 661551050010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19567215 + ... + 19600994.

It is an arithmetic number, because the mean of its divisors is an integer number (49704458490).

Almost surely, 2^661551050010 is an apocalyptic number.

661551050010 is an abundant number, since it is smaller than the sum of its proper divisors (928991621670).

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

661551050010 is a wasteful number, since it uses less digits than its factorization.

661551050010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39168782.

The product of its (nonzero) digits is 4500, while the sum is 30.

The spelling of 661551050010 in words is "six hundred sixty-one billion, five hundred fifty-one million, fifty thousand, ten".