6653721656473 has 4 divisors (see below), whose sum is σ = 6659126793088. Its totient is φ = 6648316519860.

The previous prime is 6653721656447. The next prime is 6653721656509. The reversal of 6653721656473 is 3746561273566.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6653721656473 - 2¹³ = 6653721648281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6653721656423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2702566461 + ... + 2702568922.

It is an arithmetic number, because the mean of its divisors is an integer number (1664781698272).

Almost surely, 2^{6653721656473} is an apocalyptic number.

It is an amenable number.

6653721656473 is a deficient number, since it is larger than the sum of its proper divisors (5405136615).

6653721656473 is a wasteful number, since it uses less digits than its factorization.

6653721656473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5405136614.

The product of its digits is 114307200, while the sum is 61.

The spelling of 6653721656473 in words is "six trillion, six hundred fifty-three billion, seven hundred twenty-one million, six hundred fifty-six thousand, four hundred seventy-three".