640260133 has 2 divisors, whose sum is σ = 640260134. Its totient is φ = 640260132.

The previous prime is 640260113. The next prime is 640260139. The reversal of 640260133 is 331062046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 527942529 + 112317604 = 22977^2 + 10598^2 .

It is a cyclic number.

It is not a de Polignac number, because 640260133 - 2⁹ = 640259621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640260098 and 640260107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640260139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320130066 + 320130067.

It is an arithmetic number, because the mean of its divisors is an integer number (320130067).

Almost surely, 2^640260133 is an apocalyptic number.

It is an amenable number.

640260133 is a deficient number, since it is larger than the sum of its proper divisors (1).

640260133 is an equidigital number, since it uses as much as digits as its factorization.

640260133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 640260133 is about 25303.3620888608. The cubic root of 640260133 is about 861.8906184387.

The spelling of 640260133 in words is "six hundred forty million, two hundred sixty thousand, one hundred thirty-three".