66872629 has 2 divisors, whose sum is σ = 66872630. Its totient is φ = 66872628.

The previous prime is 66872621. The next prime is 66872639. The reversal of 66872629 is 92627866.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62441604 + 4431025 = 7902^2 + 2105^2 .

It is a cyclic number.

It is not a de Polignac number, because 66872629 - 2³ = 66872621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66872621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33436314 + 33436315.

It is an arithmetic number, because the mean of its divisors is an integer number (33436315).

Almost surely, 2^66872629 is an apocalyptic number.

It is an amenable number.

66872629 is a deficient number, since it is larger than the sum of its proper divisors (1).

66872629 is an equidigital number, since it uses as much as digits as its factorization.

66872629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 46.

The square root of 66872629 is about 8177.5686484431. The cubic root of 66872629 is about 405.8972719298.

It can be divided in two parts, 6687 and 2629, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 66872629 in words is "sixty-six million, eight hundred seventy-two thousand, six hundred twenty-nine".