1621513046544 has 80 divisors (see below), whose sum is σ = 4203707493120. Its totient is φ = 538598016000.

The previous prime is 1621513046383. The next prime is 1621513046561. The reversal of 1621513046544 is 4456403151261.

It is a super-2 number, since 2×1621513046544² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1621513046496 and 1621513046505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16424722 + ... + 16523150.

It is an arithmetic number, because the mean of its divisors is an integer number (52546343664).

Almost surely, 2^{1621513046544} is an apocalyptic number.

It is an amenable number.

1621513046544 is an abundant number, since it is smaller than the sum of its proper divisors (2582194446576).

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

1621513046544 is a wasteful number, since it uses less digits than its factorization.

1621513046544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99648 (or 99642 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 1621513046544 in words is "one trillion, six hundred twenty-one billion, five hundred thirteen million, forty-six thousand, five hundred forty-four".