661501600050 has 24 divisors (see below), whose sum is σ = 1640523968496. Its totient is φ = 176400426640.

The previous prime is 661501600049. The next prime is 661501600057. The reversal of 661501600050 is 50006105166.

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 = 661501599990 and 661501600017.

It is not an unprimeable number, because it can be changed into a prime (661501600057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2205005184 + ... + 2205005483.

It is an arithmetic number, because the mean of its divisors is an integer number (68355165354).

Almost surely, 2^661501600050 is an apocalyptic number.

661501600050 is an abundant number, since it is smaller than the sum of its proper divisors (979022368446).

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

661501600050 is a wasteful number, since it uses less digits than its factorization.

661501600050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4410010682 (or 4410010677 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The spelling of 661501600050 in words is "six hundred sixty-one billion, five hundred one million, six hundred thousand, fifty".