55731602321 has 2 divisors, whose sum is σ = 55731602322. Its totient is φ = 55731602320.

The previous prime is 55731602291. The next prime is 55731602341. The reversal of 55731602321 is 12320613755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33953221696 + 21778380625 = 184264^2 + 147575^2 .

It is a cyclic number.

It is not a de Polignac number, because 55731602321 - 2³⁰ = 54657860497 is a prime.

It is a super-2 number, since 2×55731602321² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55731602341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27865801160 + 27865801161.

It is an arithmetic number, because the mean of its divisors is an integer number (27865801161).

Almost surely, 2^55731602321 is an apocalyptic number.

It is an amenable number.

55731602321 is a deficient number, since it is larger than the sum of its proper divisors (1).

55731602321 is an equidigital number, since it uses as much as digits as its factorization.

55731602321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 35.

The spelling of 55731602321 in words is "fifty-five billion, seven hundred thirty-one million, six hundred two thousand, three hundred twenty-one".