1265005049138 has 16 divisors (see below), whose sum is σ = 2009153735424. Its totient is φ = 595288176960.

The previous prime is 1265005049107. The next prime is 1265005049149. The reversal of 1265005049138 is 8319405005621.

It is a happy 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 7 ways as a sum of consecutive naturals, for example, 2697131 + ... + 3131217.

It is an arithmetic number, because the mean of its divisors is an integer number (125572108464).

Almost surely, 2^{1265005049138} is an apocalyptic number.

1265005049138 is a deficient number, since it is larger than the sum of its proper divisors (744148686286).

1265005049138 is a wasteful number, since it uses less digits than its factorization.

1265005049138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519817.

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 1265005049138 in words is "one trillion, two hundred sixty-five billion, five million, forty-nine thousand, one hundred thirty-eight".