661594151 has 8 divisors (see below), whose sum is σ = 719444880. Its totient is φ = 605847168.

The previous prime is 661594099. The next prime is 661594159. The reversal of 661594151 is 151495166.

661594151 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 661594151 - 2¹⁴ = 661577767 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 (661594159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525281 + ... + 526538.

It is an arithmetic number, because the mean of its divisors is an integer number (89930610).

Almost surely, 2^661594151 is an apocalyptic number.

661594151 is a deficient number, since it is larger than the sum of its proper divisors (57850729).

661594151 is a wasteful number, since it uses less digits than its factorization.

661594151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051873.

The product of its digits is 32400, while the sum is 38.

The square root of 661594151 is about 25721.4725667097. The cubic root of 661594151 is about 871.3591961676.

The spelling of 661594151 in words is "six hundred sixty-one million, five hundred ninety-four thousand, one hundred fifty-one".