6545023921 has 2 divisors, whose sum is σ = 6545023922. Its totient is φ = 6545023920.

The previous prime is 6545023897. The next prime is 6545023939. The reversal of 6545023921 is 1293205456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5846743296 + 698280625 = 76464^2 + 26425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6545023921 is a prime.

It is not a weakly prime, because it can be changed into another prime (6545023621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3272511960 + 3272511961.

It is an arithmetic number, because the mean of its divisors is an integer number (3272511961).

Almost surely, 2^6545023921 is an apocalyptic number.

It is an amenable number.

6545023921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6545023921 is an equidigital number, since it uses as much as digits as its factorization.

6545023921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 6545023921 is about 80901.3221214586. The cubic root of 6545023921 is about 1870.5547003226.

The spelling of 6545023921 in words is "six billion, five hundred forty-five million, twenty-three thousand, nine hundred twenty-one".