661151167 has 8 divisors (see below), whose sum is σ = 685466240. Its totient is φ = 637022880.

The previous prime is 661151147. The next prime is 661151263. The reversal of 661151167 is 761151166.

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

It is a cyclic number.

It is not a de Polignac number, because 661151167 - 2²⁷ = 526933439 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 (661151147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39468 + ... + 53665.

It is an arithmetic number, because the mean of its divisors is an integer number (85683280).

Almost surely, 2^661151167 is an apocalyptic number.

661151167 is a deficient number, since it is larger than the sum of its proper divisors (24315073).

661151167 is a wasteful number, since it uses less digits than its factorization.

661151167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93393.

The product of its digits is 7560, while the sum is 34.

The square root of 661151167 is about 25712.8599537274. The cubic root of 661151167 is about 871.1646739092.

Subtracting 661151167 from its reverse (761151166), we obtain a palindrome (99999999).

The spelling of 661151167 in words is "six hundred sixty-one million, one hundred fifty-one thousand, one hundred sixty-seven".