2404369661581 has 2 divisors, whose sum is σ = 2404369661582. Its totient is φ = 2404369661580.

The previous prime is 2404369661567. The next prime is 2404369661609. The reversal of 2404369661581 is 1851669634042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1206021276100 + 1198348385481 = 1098190^2 + 1094691^2 .

It is a cyclic number.

It is not a de Polignac number, because 2404369661581 - 2²⁷ = 2404235443853 is a prime.

It is a super-2 number, since 2×2404369661581² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2404369661531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1202184830790 + 1202184830791.

It is an arithmetic number, because the mean of its divisors is an integer number (1202184830791).

Almost surely, 2^{2404369661581} is an apocalyptic number.

It is an amenable number.

2404369661581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2404369661581 is an equidigital number, since it uses as much as digits as its factorization.

2404369661581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7464960, while the sum is 55.

The spelling of 2404369661581 in words is "two trillion, four hundred four billion, three hundred sixty-nine million, six hundred sixty-one thousand, five hundred eighty-one".