2155178079 has 48 divisors (see below), whose sum is σ = 3261323520. Its totient is φ = 1370286720.

The previous prime is 2155178023. The next prime is 2155178101. The reversal of 2155178079 is 9708715512.

2155178079 is a `hidden beast` number, since 21 + 551 + 7 + 8 + 0 + 79 = 666.

It is not a de Polignac number, because 2155178079 - 2⁷ = 2155177951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155178579) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4425174 + ... + 4425660.

It is an arithmetic number, because the mean of its divisors is an integer number (67944240).

Almost surely, 2^2155178079 is an apocalyptic number.

2155178079 is a deficient number, since it is larger than the sum of its proper divisors (1106145441).

2155178079 is a wasteful number, since it uses less digits than its factorization.

2155178079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 45.

The square root of 2155178079 is about 46423.8955603685. The cubic root of 2155178079 is about 1291.6981979252.

The spelling of 2155178079 in words is "two billion, one hundred fifty-five million, one hundred seventy-eight thousand, seventy-nine".