66472157 has 2 divisors, whose sum is σ = 66472158. Its totient is φ = 66472156.

The previous prime is 66472099. The next prime is 66472177. The reversal of 66472157 is 75127466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45778756 + 20693401 = 6766^2 + 4549^2 .

It is a cyclic number.

It is not a de Polignac number, because 66472157 - 2⁸ = 66471901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66472157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66472177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33236078 + 33236079.

It is an arithmetic number, because the mean of its divisors is an integer number (33236079).

Almost surely, 2^66472157 is an apocalyptic number.

It is an amenable number.

66472157 is a deficient number, since it is larger than the sum of its proper divisors (1).

66472157 is an equidigital number, since it uses as much as digits as its factorization.

66472157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 38.

The square root of 66472157 is about 8153.0458725559. The cubic root of 66472157 is about 405.0853998643.

The spelling of 66472157 in words is "sixty-six million, four hundred seventy-two thousand, one hundred fifty-seven".