661101650 has 72 divisors (see below), whose sum is σ = 1410659712. Its totient is φ = 229900000.

The previous prime is 661101643. The next prime is 661101659. The reversal of 661101650 is 56101166.

It is not an unprimeable number, because it can be changed into a prime (661101659) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 136775 + ... + 141525.

It is an arithmetic number, because the mean of its divisors is an integer number (19592496).

Almost surely, 2^661101650 is an apocalyptic number.

661101650 is an abundant number, since it is smaller than the sum of its proper divisors (749558062).

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

661101650 is a wasteful number, since it uses less digits than its factorization.

661101650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4808 (or 4792 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 661101650 is about 25711.8970517541. The cubic root of 661101650 is about 871.1429247036.

The spelling of 661101650 in words is "six hundred sixty-one million, one hundred one thousand, six hundred fifty".