18578097481 has 2 divisors, whose sum is σ = 18578097482. Its totient is φ = 18578097480.

The previous prime is 18578097383. The next prime is 18578097529. The reversal of 18578097481 is 18479087581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12855931456 + 5722166025 = 113384^2 + 75645^2 .

It is a cyclic number.

It is not a de Polignac number, because 18578097481 - 2³¹ = 16430613833 is a prime.

It is a super-2 number, since 2×18578097481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18578094481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9289048740 + 9289048741.

It is an arithmetic number, because the mean of its divisors is an integer number (9289048741).

Almost surely, 2^18578097481 is an apocalyptic number.

It is an amenable number.

18578097481 is a deficient number, since it is larger than the sum of its proper divisors (1).

18578097481 is an equidigital number, since it uses as much as digits as its factorization.

18578097481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4515840, while the sum is 58.

The spelling of 18578097481 in words is "eighteen billion, five hundred seventy-eight million, ninety-seven thousand, four hundred eighty-one".