661625183 has 2 divisors, whose sum is σ = 661625184. Its totient is φ = 661625182.

The previous prime is 661625171. The next prime is 661625203. The reversal of 661625183 is 381526166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661625183 - 2²⁰ = 660576607 is a prime.

It is equal to p_34366376 and since 661625183 and 34366376 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661625483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330812591 + 330812592.

It is an arithmetic number, because the mean of its divisors is an integer number (330812592).

Almost surely, 2^661625183 is an apocalyptic number.

661625183 is a deficient number, since it is larger than the sum of its proper divisors (1).

661625183 is an equidigital number, since it uses as much as digits as its factorization.

661625183 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 661625183 is about 25722.0757910399. The cubic root of 661625183 is about 871.3728196233.

The spelling of 661625183 in words is "six hundred sixty-one million, six hundred twenty-five thousand, one hundred eighty-three".