1245253522520 has 128 divisors (see below), whose sum is σ = 3390096844800. Its totient is φ = 402135031296.

The previous prime is 1245253522511. The next prime is 1245253522529. The reversal of 1245253522520 is 252253525421.

It is an interprime number because it is at equal distance from previous prime (1245253522511) and next prime (1245253522529).

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245253522529) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 243857 + ... + 1596863.

It is an arithmetic number, because the mean of its divisors is an integer number (26485131600).

Almost surely, 2^{1245253522520} is an apocalyptic number.

1245253522520 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 1245253522520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1695048422400).

1245253522520 is an abundant number, since it is smaller than the sum of its proper divisors (2144843322280).

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

1245253522520 is a wasteful number, since it uses less digits than its factorization.

1245253522520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353217 (or 1353213 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 38.

The spelling of 1245253522520 in words is "one trillion, two hundred forty-five billion, two hundred fifty-three million, five hundred twenty-two thousand, five hundred twenty".