1520645404340 has 48 divisors (see below), whose sum is σ = 3335738958720. Its totient is φ = 581193697920.

The previous prime is 1520645404297. The next prime is 1520645404349. The reversal of 1520645404340 is 434045460251.

It is a junction number, because it is equal to n+sod(n) for n = 1520645404294 and 1520645404303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520645404349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1323650 + ... + 2189369.

It is an arithmetic number, because the mean of its divisors is an integer number (69494561640).

Almost surely, 2^{1520645404340} is an apocalyptic number.

1520645404340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1520645404340 is an abundant number, since it is smaller than the sum of its proper divisors (1815093554380).

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

1520645404340 is a wasteful number, since it uses less digits than its factorization.

1520645404340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3513992 (or 3513990 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 38.

The spelling of 1520645404340 in words is "one trillion, five hundred twenty billion, six hundred forty-five million, four hundred four thousand, three hundred forty".