260661765 has 128 divisors (see below), whose sum is σ = 557383680. Its totient is φ = 100896768.

The previous prime is 260661763. The next prime is 260661767. The reversal of 260661765 is 567166062.

It is an interprime number because it is at equal distance from previous prime (260661763) and next prime (260661767).

It is not a de Polignac number, because 260661765 - 2¹ = 260661763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260661761) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1090516 + ... + 1090754.

It is an arithmetic number, because the mean of its divisors is an integer number (4354560).

Almost surely, 2^260661765 is an apocalyptic number.

It is an amenable number.

260661765 is an abundant number, since it is smaller than the sum of its proper divisors (296721915).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

260661765 is a wasteful number, since it uses less digits than its factorization.

260661765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 260661765 is about 16145.0229172956. The cubic root of 260661765 is about 638.7914734172.

The spelling of 260661765 in words is "two hundred sixty million, six hundred sixty-one thousand, seven hundred sixty-five".