1265711205870 has 48 divisors (see below), whose sum is σ = 3412732443120. Its totient is φ = 337522987584.

The previous prime is 1265711205859. The next prime is 1265711205907. The reversal of 1265711205870 is 785021175621.

1265711205870 is a `hidden beast` number, since 1 + 2 + 6 + 57 + 1 + 12 + 0 + 587 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 260431975 + ... + 260436834.

It is an arithmetic number, because the mean of its divisors is an integer number (71098592565).

Almost surely, 2^{1265711205870} is an apocalyptic number.

1265711205870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1265711205870 is an abundant number, since it is smaller than the sum of its proper divisors (2147021237250).

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

1265711205870 is an equidigital number, since it uses as much as digits as its factorization.

1265711205870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520868831 (or 520868819 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 45.

The spelling of 1265711205870 in words is "one trillion, two hundred sixty-five billion, seven hundred eleven million, two hundred five thousand, eight hundred seventy".