129765262465 has 4 divisors (see below), whose sum is σ = 155718314964. Its totient is φ = 103812209968.

The previous prime is 129765262453. The next prime is 129765262493. The reversal of 129765262465 is 564262567921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46030844304 + 83734418161 = 214548^2 + 289369^2 .

It is a cyclic number.

It is not a de Polignac number, because 129765262465 - 2²¹ = 129763165313 is a prime.

It is a super-2 number, since 2×129765262465² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12976526242 + ... + 12976526251.

It is an arithmetic number, because the mean of its divisors is an integer number (38929578741).

Almost surely, 2^129765262465 is an apocalyptic number.

It is an amenable number.

129765262465 is a deficient number, since it is larger than the sum of its proper divisors (25953052499).

129765262465 is an equidigital number, since it uses as much as digits as its factorization.

129765262465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25953052498.

The product of its digits is 10886400, while the sum is 55.

The spelling of 129765262465 in words is "one hundred twenty-nine billion, seven hundred sixty-five million, two hundred sixty-two thousand, four hundred sixty-five".