661102522050 has 48 divisors (see below), whose sum is σ = 1735977452832. Its totient is φ = 165923769600.

The previous prime is 661102522049. The next prime is 661102522099. The reversal of 661102522050 is 50225201166.

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

It is a junction number, because it is equal to n+sod(n) for n = 661102521999 and 661102522017.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129625396 + ... + 129630495.

It is an arithmetic number, because the mean of its divisors is an integer number (36166196934).

Almost surely, 2^661102522050 is an apocalyptic number.

661102522050 is an abundant number, since it is smaller than the sum of its proper divisors (1074874930782).

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

661102522050 is a wasteful number, since it uses less digits than its factorization.

661102522050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259255923 (or 259255918 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 661102522050 in words is "six hundred sixty-one billion, one hundred two million, five hundred twenty-two thousand, fifty".