66926401 has 2 divisors, whose sum is σ = 66926402. Its totient is φ = 66926400.

The previous prime is 66926383. The next prime is 66926407. The reversal of 66926401 is 10462966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64963600 + 1962801 = 8060^2 + 1401^2 .

It is a cyclic number.

It is not a de Polignac number, because 66926401 - 2⁷ = 66926273 is a prime.

It is not a weakly prime, because it can be changed into another prime (66926407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33463200 + 33463201.

It is an arithmetic number, because the mean of its divisors is an integer number (33463201).

Almost surely, 2^66926401 is an apocalyptic number.

It is an amenable number.

66926401 is a deficient number, since it is larger than the sum of its proper divisors (1).

66926401 is an equidigital number, since it uses as much as digits as its factorization.

66926401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 66926401 is about 8180.8557620826. The cubic root of 66926401 is about 406.0060362130.

The spelling of 66926401 in words is "sixty-six million, nine hundred twenty-six thousand, four hundred one".