1640257573 has 2 divisors, whose sum is σ = 1640257574. Its totient is φ = 1640257572.

The previous prime is 1640257561. The next prime is 1640257579. The reversal of 1640257573 is 3757520461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 881971204 + 758286369 = 29698^2 + 27537^2 .

It is an emirp because it is prime and its reverse (3757520461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1640257573 - 2²¹ = 1638160421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640257579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820128786 + 820128787.

It is an arithmetic number, because the mean of its divisors is an integer number (820128787).

Almost surely, 2^1640257573 is an apocalyptic number.

It is an amenable number.

1640257573 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640257573 is an equidigital number, since it uses as much as digits as its factorization.

1640257573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 40.

The square root of 1640257573 is about 40500.0934937192. The cubic root of 1640257573 is about 1179.3354423775.

The spelling of 1640257573 in words is "one billion, six hundred forty million, two hundred fifty-seven thousand, five hundred seventy-three".