661013167 has 4 divisors (see below), whose sum is σ = 672216840. Its totient is φ = 649809496.

The previous prime is 661013161. The next prime is 661013183. The reversal of 661013167 is 761310166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 661013167 - 2⁷ = 661013039 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661013161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5601748 + ... + 5601865.

It is an arithmetic number, because the mean of its divisors is an integer number (168054210).

Almost surely, 2^661013167 is an apocalyptic number.

661013167 is a deficient number, since it is larger than the sum of its proper divisors (11203673).

661013167 is a wasteful number, since it uses less digits than its factorization.

661013167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11203672.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 661013167 is about 25710.1763315618. The cubic root of 661013167 is about 871.1040578724.

The spelling of 661013167 in words is "six hundred sixty-one million, thirteen thousand, one hundred sixty-seven".