6555221673731 has 2 divisors, whose sum is σ = 6555221673732. Its totient is φ = 6555221673730.

The previous prime is 6555221673697. The next prime is 6555221673799. The reversal of 6555221673731 is 1373761225556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6555221673731 - 2¹⁸ = 6555221411587 is a prime.

It is a super-2 number, since 2×6555221673731² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6555221673431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3277610836865 + 3277610836866.

It is an arithmetic number, because the mean of its divisors is an integer number (3277610836866).

Almost surely, 2^{6555221673731} is an apocalyptic number.

6555221673731 is a deficient number, since it is larger than the sum of its proper divisors (1).

6555221673731 is an equidigital number, since it uses as much as digits as its factorization.

6555221673731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7938000, while the sum is 53.

The spelling of 6555221673731 in words is "six trillion, five hundred fifty-five billion, two hundred twenty-one million, six hundred seventy-three thousand, seven hundred thirty-one".