1245545521000 has 128 divisors (see below), whose sum is σ = 3219787584000. Its totient is φ = 447192096000.

The previous prime is 1245545520977. The next prime is 1245545521039. The reversal of 1245545521000 is 1255455421.

It is a super-2 number, since 2×1245545521000² (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 31 ways as a sum of consecutive naturals, for example, 152346 + ... + 1585654.

It is an arithmetic number, because the mean of its divisors is an integer number (25154590500).

Almost surely, 2^{1245545521000} is an apocalyptic number.

1245545521000 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 1245545521000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1609893792000).

1245545521000 is an abundant number, since it is smaller than the sum of its proper divisors (1974242063000).

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

1245545521000 is a wasteful number, since it uses less digits than its factorization.

1245545521000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433420 (or 1433406 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 34.

The spelling of 1245545521000 in words is "one trillion, two hundred forty-five billion, five hundred forty-five million, five hundred twenty-one thousand".