661101672 has 64 divisors (see below), whose sum is σ = 2060582400. Its totient is φ = 171714240.

The previous prime is 661101659. The next prime is 661101697. The reversal of 661101672 is 276101166.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177022 + ... + 180717.

It is an arithmetic number, because the mean of its divisors is an integer number (32196600).

Almost surely, 2^661101672 is an apocalyptic number.

It is an amenable number.

661101672 is an abundant number, since it is smaller than the sum of its proper divisors (1399480728).

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

661101672 is a wasteful number, since it uses less digits than its factorization.

661101672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357766 (or 357762 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 661101672 is about 25711.8974795716. The cubic root of 661101672 is about 871.1429343668.

The spelling of 661101672 in words is "six hundred sixty-one million, one hundred one thousand, six hundred seventy-two".