1621513046545 has 32 divisors (see below), whose sum is σ = 2355781252608. Its totient is φ = 1045964295168.

The previous prime is 1621513046383. The next prime is 1621513046561. The reversal of 1621513046545 is 5456403151261.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1621513046545 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 505884 + ... + 1870546.

It is an arithmetic number, because the mean of its divisors is an integer number (73618164144).

Almost surely, 2^{1621513046545} is an apocalyptic number.

It is an amenable number.

1621513046545 is a deficient number, since it is larger than the sum of its proper divisors (734268206063).

1621513046545 is a wasteful number, since it uses less digits than its factorization.

1621513046545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366689.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 1621513046545 in words is "one trillion, six hundred twenty-one billion, five hundred thirteen million, forty-six thousand, five hundred forty-five".