661007167 has 4 divisors (see below), whose sum is σ = 661070176. Its totient is φ = 660944160.

The previous prime is 661007153. The next prime is 661007177. The reversal of 661007167 is 761700166.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 761700166 = 2 ⋅380850083.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661007167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661007117) 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, 11559 + ... + 38152.

It is an arithmetic number, because the mean of its divisors is an integer number (165267544).

Almost surely, 2^661007167 is an apocalyptic number.

661007167 is a deficient number, since it is larger than the sum of its proper divisors (63009).

661007167 is a wasteful number, since it uses less digits than its factorization.

661007167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63008.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 661007167 is about 25710.0596459829. The cubic root of 661007167 is about 871.1014222012.

The spelling of 661007167 in words is "six hundred sixty-one million, seven thousand, one hundred sixty-seven".