661110157 has 8 divisors (see below), whose sum is σ = 671616000. Its totient is φ = 650657904.

The previous prime is 661110143. The next prime is 661110167. The reversal of 661110157 is 751011166.

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

It is not a de Polignac number, because 661110157 - 2¹⁹ = 660585869 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 (661110167) 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, 11844 + ... + 38242.

It is an arithmetic number, because the mean of its divisors is an integer number (83952000).

Almost surely, 2^661110157 is an apocalyptic number.

It is an amenable number.

661110157 is a deficient number, since it is larger than the sum of its proper divisors (10505843).

661110157 is a wasteful number, since it uses less digits than its factorization.

661110157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26795.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 661110157 is about 25712.0624804779. The cubic root of 661110157 is about 871.1466612853.

The spelling of 661110157 in words is "six hundred sixty-one million, one hundred ten thousand, one hundred fifty-seven".