2145023566520 has 64 divisors (see below), whose sum is σ = 5020620084000. Its totient is φ = 823794754048.

The previous prime is 2145023566487. The next prime is 2145023566547. The reversal of 2145023566520 is 256653205412.

It is a super-2 number, since 2×2145023566520² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4957607 + ... + 5372886.

Almost surely, 2^{2145023566520} is an apocalyptic number.

2145023566520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145023566520 is an abundant number, since it is smaller than the sum of its proper divisors (2875596517480).

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

2145023566520 is a wasteful number, since it uses less digits than its factorization.

2145023566520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10330712 (or 10330708 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 2145023566520 in words is "two trillion, one hundred forty-five billion, twenty-three million, five hundred sixty-six thousand, five hundred twenty".