1265061515 has 24 divisors (see below), whose sum is σ = 1618293840. Its totient is φ = 946741824.

The previous prime is 1265061491. The next prime is 1265061517. The reversal of 1265061515 is 5151605621.

It is not a de Polignac number, because 1265061515 - 2⁶ = 1265061451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1265061517) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 653489 + ... + 655421.

It is an arithmetic number, because the mean of its divisors is an integer number (67428910).

Almost surely, 2^1265061515 is an apocalyptic number.

1265061515 is a deficient number, since it is larger than the sum of its proper divisors (353232325).

1265061515 is an equidigital number, since it uses as much as digits as its factorization.

1265061515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2123 (or 2040 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 1265061515 is about 35567.7032573092. The cubic root of 1265061515 is about 1081.5266233330.

The spelling of 1265061515 in words is "one billion, two hundred sixty-five million, sixty-one thousand, five hundred fifteen".