1621045460540 has 24 divisors (see below), whose sum is σ = 3713667782832. Its totient is φ = 589471076480.

The previous prime is 1621045460521. The next prime is 1621045460549. The reversal of 1621045460540 is 450645401261.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1621045460494 and 1621045460503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621045460549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3684194009 + ... + 3684194448.

It is an arithmetic number, because the mean of its divisors is an integer number (154736157618).

Almost surely, 2^{1621045460540} is an apocalyptic number.

1621045460540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1621045460540 is an abundant number, since it is smaller than the sum of its proper divisors (2092622322292).

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

1621045460540 is a wasteful number, since it uses less digits than its factorization.

1621045460540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7368388477 (or 7368388475 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 1621045460540 in words is "one trillion, six hundred twenty-one billion, forty-five million, four hundred sixty thousand, five hundred forty".