1245445120520 has 16 divisors (see below), whose sum is σ = 2802251521260. Its totient is φ = 498178048192.

The previous prime is 1245445120499. The next prime is 1245445120583. The reversal of 1245445120520 is 250215445421.

It can be written as a sum of positive squares in 2 ways, for example, as 1241677861636 + 3767258884 = 1114306^2 + 61378^2 .

It is a super-2 number, since 2×1245445120520² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15568063967 + ... + 15568064046.

Almost surely, 2^{1245445120520} is an apocalyptic number.

1245445120520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245445120520 is an abundant number, since it is smaller than the sum of its proper divisors (1556806400740).

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

1245445120520 is a wasteful number, since it uses less digits than its factorization.

1245445120520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31136128024 (or 31136128020 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 35.

The spelling of 1245445120520 in words is "one trillion, two hundred forty-five billion, four hundred forty-five million, one hundred twenty thousand, five hundred twenty".