1265263751525 has 6 divisors (see below), whose sum is σ = 1568927051922. Its totient is φ = 1012211001200.

The previous prime is 1265263751519. The next prime is 1265263751567. The reversal of 1265263751525 is 5251573625621.

It can be written as a sum of positive squares in 3 ways, for example, as 32262266689 + 1233001484836 = 179617^2 + 1110406^2 .

It is not a de Polignac number, because 1265263751525 - 2¹⁶ = 1265263685989 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 5 ways as a sum of consecutive naturals, for example, 25305275006 + ... + 25305275055.

It is an arithmetic number, because the mean of its divisors is an integer number (261487841987).

Almost surely, 2^{1265263751525} is an apocalyptic number.

It is an amenable number.

1265263751525 is a deficient number, since it is larger than the sum of its proper divisors (303663300397).

1265263751525 is an equidigital number, since it uses as much as digits as its factorization.

1265263751525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50610550071 (or 50610550066 counting only the distinct ones).

The product of its digits is 3780000, while the sum is 50.

The spelling of 1265263751525 in words is "one trillion, two hundred sixty-five billion, two hundred sixty-three million, seven hundred fifty-one thousand, five hundred twenty-five".