51553666001 has 2 divisors, whose sum is σ = 51553666002. Its totient is φ = 51553666000.

The previous prime is 51553665959. The next prime is 51553666007. The reversal of 51553666001 is 10066635515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26228126401 + 25325539600 = 161951^2 + 159140^2 .

It is a cyclic number.

It is not a de Polignac number, because 51553666001 - 2¹⁸ = 51553403857 is a prime.

It is not a weakly prime, because it can be changed into another prime (51553666007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25776833000 + 25776833001.

It is an arithmetic number, because the mean of its divisors is an integer number (25776833001).

Almost surely, 2^51553666001 is an apocalyptic number.

It is an amenable number.

51553666001 is a deficient number, since it is larger than the sum of its proper divisors (1).

51553666001 is an equidigital number, since it uses as much as digits as its factorization.

51553666001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 38.

The spelling of 51553666001 in words is "fifty-one billion, five hundred fifty-three million, six hundred sixty-six thousand, one".