661098177 has 36 divisors (see below), whose sum is σ = 1004849664. Its totient is φ = 418785840.

The previous prime is 661098173. The next prime is 661098199. The reversal of 661098177 is 771890166.

It is not a de Polignac number, because 661098177 - 2² = 661098173 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661098173) 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, 908988 + ... + 909714.

Almost surely, 2^661098177 is an apocalyptic number.

It is an amenable number.

661098177 is a deficient number, since it is larger than the sum of its proper divisors (343751487).

661098177 is a wasteful number, since it uses less digits than its factorization.

661098177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970 (or 944 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 661098177 is about 25711.8295148362. The cubic root of 661098177 is about 871.1413992273.

The spelling of 661098177 in words is "six hundred sixty-one million, ninety-eight thousand, one hundred seventy-seven".