661110151 has 4 divisors (see below), whose sum is σ = 711964792. Its totient is φ = 610255512.

The previous prime is 661110143. The next prime is 661110167. The reversal of 661110151 is 151011166.

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 661110151 - 2³ = 661110143 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 (661110451) 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 3 ways as a sum of consecutive naturals, for example, 25427301 + ... + 25427326.

It is an arithmetic number, because the mean of its divisors is an integer number (177991198).

Almost surely, 2^661110151 is an apocalyptic number.

661110151 is a deficient number, since it is larger than the sum of its proper divisors (50854641).

661110151 is a wasteful number, since it uses less digits than its factorization.

661110151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50854640.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 661110151 is about 25712.0623638012. The cubic root of 661110151 is about 871.1466586499.

The spelling of 661110151 in words is "six hundred sixty-one million, one hundred ten thousand, one hundred fifty-one".