661378227 has 8 divisors (see below), whose sum is σ = 902345664. Its totient is φ = 430664808.

The previous prime is 661378213. The next prime is 661378229. The reversal of 661378227 is 722873166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 661378227 - 2⁷ = 661378099 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (661378229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2563353 + ... + 2563610.

It is an arithmetic number, because the mean of its divisors is an integer number (112793208).

Almost surely, 2^661378227 is an apocalyptic number.

661378227 is a deficient number, since it is larger than the sum of its proper divisors (240967437).

661378227 is a wasteful number, since it uses less digits than its factorization.

661378227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5127009.

The product of its digits is 169344, while the sum is 42.

The square root of 661378227 is about 25717.2748750718. The cubic root of 661378227 is about 871.2643908982.

The spelling of 661378227 in words is "six hundred sixty-one million, three hundred seventy-eight thousand, two hundred twenty-seven".