1265516642 has 32 divisors (see below), whose sum is σ = 2114380800. Its totient is φ = 564378048.

The previous prime is 1265516591. The next prime is 1265516653. The reversal of 1265516642 is 2466155621.

It is a junction number, because it is equal to n+sod(n) for n = 1265516596 and 1265516605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89984 + ... + 103092.

It is an arithmetic number, because the mean of its divisors is an integer number (66074400).

Almost surely, 2^1265516642 is an apocalyptic number.

1265516642 is a deficient number, since it is larger than the sum of its proper divisors (848864158).

1265516642 is a wasteful number, since it uses less digits than its factorization.

1265516642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13250.

The product of its digits is 86400, while the sum is 38.

The square root of 1265516642 is about 35574.1007194841. The cubic root of 1265516642 is about 1081.6563068685.

The spelling of 1265516642 in words is "one billion, two hundred sixty-five million, five hundred sixteen thousand, six hundred forty-two".