259736661 has 6 divisors (see below), whose sum is σ = 375175190. Its totient is φ = 173157768.

The previous prime is 259736657. The next prime is 259736663. The reversal of 259736661 is 166637952.

It can be written as a sum of positive squares in only one way, i.e., 174081636 + 85655025 = 13194^2 + 9255^2 .

It is not a de Polignac number, because 259736661 - 2² = 259736657 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 (259736663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14429806 + ... + 14429823.

Almost surely, 2^259736661 is an apocalyptic number.

It is an amenable number.

259736661 is a deficient number, since it is larger than the sum of its proper divisors (115438529).

259736661 is a wasteful number, since it uses less digits than its factorization.

259736661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28859635 (or 28859632 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The square root of 259736661 is about 16116.3476321405. The cubic root of 259736661 is about 638.0348747491.

The spelling of 259736661 in words is "two hundred fifty-nine million, seven hundred thirty-six thousand, six hundred sixty-one".