66003472261 has 2 divisors, whose sum is σ = 66003472262. Its totient is φ = 66003472260.

The previous prime is 66003472243. The next prime is 66003472313. The reversal of 66003472261 is 16227430066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54024169761 + 11979302500 = 232431^2 + 109450^2 .

It is a cyclic number.

It is not a de Polignac number, because 66003472261 - 2¹⁵ = 66003439493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66003472261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66003472861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33001736130 + 33001736131.

It is an arithmetic number, because the mean of its divisors is an integer number (33001736131).

Almost surely, 2^66003472261 is an apocalyptic number.

It is an amenable number.

66003472261 is a deficient number, since it is larger than the sum of its proper divisors (1).

66003472261 is an equidigital number, since it uses as much as digits as its factorization.

66003472261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 37.

The spelling of 66003472261 in words is "sixty-six billion, three million, four hundred seventy-two thousand, two hundred sixty-one".