32553256721 has 2 divisors, whose sum is σ = 32553256722. Its totient is φ = 32553256720.

The previous prime is 32553256699. The next prime is 32553256763. The reversal of 32553256721 is 12765235523.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16357131025 + 16196125696 = 127895^2 + 127264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32553256721 is a prime.

It is a super-4 number, since 4×32553256721⁴ (a number of 43 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (32553256321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16276628360 + 16276628361.

It is an arithmetic number, because the mean of its divisors is an integer number (16276628361).

Almost surely, 2^32553256721 is an apocalyptic number.

It is an amenable number.

32553256721 is a deficient number, since it is larger than the sum of its proper divisors (1).

32553256721 is an equidigital number, since it uses as much as digits as its factorization.

32553256721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 41.

The spelling of 32553256721 in words is "thirty-two billion, five hundred fifty-three million, two hundred fifty-six thousand, seven hundred twenty-one".