1265860625 has 10 divisors (see below), whose sum is σ = 1581820218. Its totient is φ = 1012688000.

The previous prime is 1265860619. The next prime is 1265860649. The reversal of 1265860625 is 5260685621.

It can be written as a sum of positive squares in 5 ways, for example, as 380679121 + 885181504 = 19511^2 + 29752^2 .

It is not a de Polignac number, because 1265860625 - 2²² = 1261666321 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1012064 + ... + 1013313.

Almost surely, 2^1265860625 is an apocalyptic number.

It is an amenable number.

1265860625 is a deficient number, since it is larger than the sum of its proper divisors (315959593).

1265860625 is an frugal number, since it uses more digits than its factorization.

1265860625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025397 (or 2025382 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 1265860625 is about 35578.9351302143. The cubic root of 1265860625 is about 1081.7543004897.

The spelling of 1265860625 in words is "one billion, two hundred sixty-five million, eight hundred sixty thousand, six hundred twenty-five".