66372401 has 2 divisors, whose sum is σ = 66372402. Its totient is φ = 66372400.

The previous prime is 66372391. The next prime is 66372409. The reversal of 66372401 is 10427366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52940176 + 13432225 = 7276^2 + 3665^2 .

It is a cyclic number.

It is not a de Polignac number, because 66372401 - 2⁶ = 66372337 is a prime.

It is a super-2 number, since 2×66372401² = 8810591229009602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66372409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33186200 + 33186201.

It is an arithmetic number, because the mean of its divisors is an integer number (33186201).

Almost surely, 2^66372401 is an apocalyptic number.

It is an amenable number.

66372401 is a deficient number, since it is larger than the sum of its proper divisors (1).

66372401 is an equidigital number, since it uses as much as digits as its factorization.

66372401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 66372401 is about 8146.9258619433. The cubic root of 66372401 is about 404.8826586848.

Adding to 66372401 its reverse (10427366), we get a palindrome (76799767).

The spelling of 66372401 in words is "sixty-six million, three hundred seventy-two thousand, four hundred one".