1265211055 has 4 divisors (see below), whose sum is σ = 1518253272. Its totient is φ = 1012168840.

The previous prime is 1265211037. The next prime is 1265211089. The reversal of 1265211055 is 5501125621.

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

It is not a de Polignac number, because 1265211055 - 2⁵ = 1265211023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126521101 + ... + 126521110.

It is an arithmetic number, because the mean of its divisors is an integer number (379563318).

Almost surely, 2^1265211055 is an apocalyptic number.

1265211055 is a deficient number, since it is larger than the sum of its proper divisors (253042217).

1265211055 is an equidigital number, since it uses as much as digits as its factorization.

1265211055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253042216.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 1265211055 is about 35569.8053832179. The cubic root of 1265211055 is about 1081.5692365754.

Adding to 1265211055 its reverse (5501125621), we get a palindrome (6766336676).

The spelling of 1265211055 in words is "one billion, two hundred sixty-five million, two hundred eleven thousand, fifty-five".