18537552461 has 2 divisors, whose sum is σ = 18537552462. Its totient is φ = 18537552460.

The previous prime is 18537552431. The next prime is 18537552487. The reversal of 18537552461 is 16425573581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18524843236 + 12709225 = 136106^2 + 3565^2 .

It is a cyclic number.

It is not a de Polignac number, because 18537552461 - 2³⁴ = 1357683277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18537552431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9268776230 + 9268776231.

It is an arithmetic number, because the mean of its divisors is an integer number (9268776231).

Almost surely, 2^18537552461 is an apocalyptic number.

It is an amenable number.

18537552461 is a deficient number, since it is larger than the sum of its proper divisors (1).

18537552461 is an equidigital number, since it uses as much as digits as its factorization.

18537552461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008000, while the sum is 47.

The spelling of 18537552461 in words is "eighteen billion, five hundred thirty-seven million, five hundred fifty-two thousand, four hundred sixty-one".