18351683477 has 2 divisors, whose sum is σ = 18351683478. Its totient is φ = 18351683476.

The previous prime is 18351683473. The next prime is 18351683507. The reversal of 18351683477 is 77438615381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16620624241 + 1731059236 = 128921^2 + 41606^2 .

It is a cyclic number.

It is not a de Polignac number, because 18351683477 - 2² = 18351683473 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18351683473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9175841738 + 9175841739.

It is an arithmetic number, because the mean of its divisors is an integer number (9175841739).

Almost surely, 2^18351683477 is an apocalyptic number.

It is an amenable number.

18351683477 is a deficient number, since it is larger than the sum of its proper divisors (1).

18351683477 is an equidigital number, since it uses as much as digits as its factorization.

18351683477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 53.

The spelling of 18351683477 in words is "eighteen billion, three hundred fifty-one million, six hundred eighty-three thousand, four hundred seventy-seven".