84420631755 has 128 divisors (see below), whose sum is σ = 168289228800. Its totient is φ = 39901704192.

The previous prime is 84420631741. The next prime is 84420631783. The reversal of 84420631755 is 55713602448.

84420631755 is a `hidden beast` number, since 8 + 4 + 4 + 2 + 0 + 631 + 7 + 5 + 5 = 666.

It is not a de Polignac number, because 84420631755 - 2⁵ = 84420631723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 84420631755.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 7276239 + ... + 7287831.

It is an arithmetic number, because the mean of its divisors is an integer number (1314759600).

Almost surely, 2^84420631755 is an apocalyptic number.

84420631755 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

84420631755 is a deficient number, since it is larger than the sum of its proper divisors (83868597045).

84420631755 is a wasteful number, since it uses less digits than its factorization.

84420631755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11810 (or 11804 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 84420631755 in words is "eighty-four billion, four hundred twenty million, six hundred thirty-one thousand, seven hundred fifty-five".