661963159 has 16 divisors (see below), whose sum is σ = 778587264. Its totient is φ = 554853600.

The previous prime is 661963157. The next prime is 661963171. The reversal of 661963159 is 951369166.

It is a cyclic number.

It is not a de Polignac number, because 661963159 - 2¹ = 661963157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661963157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153892 + ... + 158134.

It is an arithmetic number, because the mean of its divisors is an integer number (48661704).

Almost surely, 2^661963159 is an apocalyptic number.

661963159 is a deficient number, since it is larger than the sum of its proper divisors (116624105).

661963159 is a wasteful number, since it uses less digits than its factorization.

661963159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5358.

The product of its digits is 262440, while the sum is 46.

The square root of 661963159 is about 25728.6447175128. The cubic root of 661963159 is about 871.5211679507.

The spelling of 661963159 in words is "six hundred sixty-one million, nine hundred sixty-three thousand, one hundred fifty-nine".