653445541561 has 4 divisors (see below), whose sum is σ = 691883514612. Its totient is φ = 615007568512.

The previous prime is 653445541543. The next prime is 653445541589. The reversal of 653445541561 is 165145544356.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 415051620025 + 238393921536 = 644245^2 + 488256^2 .

It is a cyclic number.

It is not a de Polignac number, because 653445541561 - 2¹³ = 653445533369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (653445544561) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 19218986500 + ... + 19218986533.

It is an arithmetic number, because the mean of its divisors is an integer number (172970878653).

Almost surely, 2^653445541561 is an apocalyptic number.

It is an amenable number.

653445541561 is a deficient number, since it is larger than the sum of its proper divisors (38437973051).

653445541561 is a wasteful number, since it uses less digits than its factorization.

653445541561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38437973050.

The product of its digits is 4320000, while the sum is 49.

The spelling of 653445541561 in words is "six hundred fifty-three billion, four hundred forty-five million, five hundred forty-one thousand, five hundred sixty-one".