40657841569 has 2 divisors, whose sum is σ = 40657841570. Its totient is φ = 40657841568.

The previous prime is 40657841561. The next prime is 40657841599. The reversal of 40657841569 is 96514875604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39496395169 + 1161446400 = 198737^2 + 34080^2 .

It is a cyclic number.

It is not a de Polignac number, because 40657841569 - 2³ = 40657841561 is a prime.

It is a super-2 number, since 2×40657841569² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40657841561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20328920784 + 20328920785.

It is an arithmetic number, because the mean of its divisors is an integer number (20328920785).

Almost surely, 2^40657841569 is an apocalyptic number.

It is an amenable number.

40657841569 is a deficient number, since it is larger than the sum of its proper divisors (1).

40657841569 is an equidigital number, since it uses as much as digits as its factorization.

40657841569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7257600, while the sum is 55.

The spelling of 40657841569 in words is "forty billion, six hundred fifty-seven million, eight hundred forty-one thousand, five hundred sixty-nine".