66901573 has 2 divisors, whose sum is σ = 66901574. Its totient is φ = 66901572.

The previous prime is 66901547. The next prime is 66901591. The reversal of 66901573 is 37510966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63393444 + 3508129 = 7962^2 + 1873^2 .

It is a cyclic number.

It is not a de Polignac number, because 66901573 - 2²⁵ = 33347141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66901543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33450786 + 33450787.

It is an arithmetic number, because the mean of its divisors is an integer number (33450787).

Almost surely, 2^66901573 is an apocalyptic number.

It is an amenable number.

66901573 is a deficient number, since it is larger than the sum of its proper divisors (1).

66901573 is an equidigital number, since it uses as much as digits as its factorization.

66901573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 66901573 is about 8179.3381761607. The cubic root of 66901573 is about 405.9558240173.

The spelling of 66901573 in words is "sixty-six million, nine hundred one thousand, five hundred seventy-three".