18499499477 has 2 divisors, whose sum is σ = 18499499478. Its totient is φ = 18499499476.

The previous prime is 18499499471. The next prime is 18499499507. The reversal of 18499499477 is 77499499481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9555258001 + 8944241476 = 97751^2 + 94574^2 .

It is a cyclic number.

It is not a de Polignac number, because 18499499477 - 2⁶ = 18499499413 is a prime.

It is a super-3 number, since 3×18499499477³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18499499477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18499499471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9249749738 + 9249749739.

It is an arithmetic number, because the mean of its divisors is an integer number (9249749739).

Almost surely, 2^18499499477 is an apocalyptic number.

It is an amenable number.

18499499477 is a deficient number, since it is larger than the sum of its proper divisors (1).

18499499477 is an equidigital number, since it uses as much as digits as its factorization.

18499499477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 164602368, while the sum is 71.

The spelling of 18499499477 in words is "eighteen billion, four hundred ninety-nine million, four hundred ninety-nine thousand, four hundred seventy-seven".