1265145900000 has 288 divisors, whose sum is σ = 4169829113856. Its totient is φ = 335841600000.

The previous prime is 1265145899987. The next prime is 1265145900001. The reversal of 1265145900000 is 95415621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265145900001) 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 47 ways as a sum of consecutive naturals, for example, 66890545 + ... + 66909455.

It is an arithmetic number, because the mean of its divisors is an integer number (14478573312).

Almost surely, 2^{1265145900000} is an apocalyptic number.

1265145900000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1265145900000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2084914556928).

1265145900000 is an abundant number, since it is smaller than the sum of its proper divisors (2904683213856).

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

1265145900000 is an equidigital number, since it uses as much as digits as its factorization.

1265145900000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19172 (or 19144 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The spelling of 1265145900000 in words is "one trillion, two hundred sixty-five billion, one hundred forty-five million, nine hundred thousand".