398533765455 has 24 divisors (see below), whose sum is σ = 789476412192. Its totient is φ = 182186864064.

The previous prime is 398533765451. The next prime is 398533765457. The reversal of 398533765455 is 554567335893.

398533765455 is a `hidden beast` number, since 3 + 9 + 8 + 53 + 37 + 6 + 545 + 5 = 666.

It is not a de Polignac number, because 398533765455 - 2² = 398533765451 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 398533765392 and 398533765401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398533765451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 632592964 + ... + 632593593.

It is an arithmetic number, because the mean of its divisors is an integer number (32894850508).

Almost surely, 2^398533765455 is an apocalyptic number.

398533765455 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

398533765455 is a deficient number, since it is larger than the sum of its proper divisors (390942646737).

398533765455 is a wasteful number, since it uses less digits than its factorization.

398533765455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265186575 (or 1265186572 counting only the distinct ones).

The product of its digits is 204120000, while the sum is 63.

The spelling of 398533765455 in words is "three hundred ninety-eight billion, five hundred thirty-three million, seven hundred sixty-five thousand, four hundred fifty-five".