1265860609220 has 24 divisors (see below), whose sum is σ = 2666966273664. Its totient is φ = 504694911456.

The previous prime is 1265860609219. The next prime is 1265860609253. The reversal of 1265860609220 is 229060685621.

It is a happy number.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 103076972 + ... + 103089251.

It is an arithmetic number, because the mean of its divisors is an integer number (111123594736).

Almost surely, 2^{1265860609220} is an apocalyptic number.

1265860609220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265860609220 is an abundant number, since it is smaller than the sum of its proper divisors (1401105664444).

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

1265860609220 is a wasteful number, since it uses less digits than its factorization.

1265860609220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206166539 (or 206166537 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 47.

The spelling of 1265860609220 in words is "one trillion, two hundred sixty-five billion, eight hundred sixty million, six hundred nine thousand, two hundred twenty".