1261366425 has 120 divisors (see below), whose sum is σ = 2699639712. Its totient is φ = 575424000.

The previous prime is 1261366423. The next prime is 1261366439. The reversal of 1261366425 is 5246631621.

1261366425 is a `hidden beast` number, since 1 + 2 + 6 + 1 + 3 + 6 + 642 + 5 = 666.

It is not a de Polignac number, because 1261366425 - 2¹ = 1261366423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1261366425.

It is not an unprimeable number, because it can be changed into a prime (1261366423) 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 119 ways as a sum of consecutive naturals, for example, 377010 + ... + 380340.

Almost surely, 2^1261366425 is an apocalyptic number.

1261366425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1261366425 is an abundant number, since it is smaller than the sum of its proper divisors (1438273287).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261366425 is a wasteful number, since it uses less digits than its factorization.

1261366425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3381 (or 3367 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 1261366425 is about 35515.7208148730. The cubic root of 1261366425 is about 1080.4725940947.

The spelling of 1261366425 in words is "one billion, two hundred sixty-one million, three hundred sixty-six thousand, four hundred twenty-five".