78655820001 has 32 divisors (see below), whose sum is σ = 118358506368. Its totient is φ = 46043159040.

The previous prime is 78655819999. The next prime is 78655820011. The reversal of 78655820001 is 10002855687.

It is not a de Polignac number, because 78655820001 - 2¹ = 78655819999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78655820011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67830 + ... + 402383.

It is an arithmetic number, because the mean of its divisors is an integer number (3698703324).

Almost surely, 2^78655820001 is an apocalyptic number.

It is an amenable number.

78655820001 is a deficient number, since it is larger than the sum of its proper divisors (39702686367).

78655820001 is a wasteful number, since it uses less digits than its factorization.

78655820001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470401.

The product of its (nonzero) digits is 134400, while the sum is 42.

The spelling of 78655820001 in words is "seventy-eight billion, six hundred fifty-five million, eight hundred twenty thousand, one".