20155797178 has 16 divisors (see below), whose sum is σ = 32991045696. Its totient is φ = 9159272640.

The previous prime is 20155797149. The next prime is 20155797197. The reversal of 20155797178 is 87179755102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37326 + ... + 204217.

It is an arithmetic number, because the mean of its divisors is an integer number (2061940356).

Almost surely, 2^20155797178 is an apocalyptic number.

20155797178 is a deficient number, since it is larger than the sum of its proper divisors (12835248518).

20155797178 is a wasteful number, since it uses less digits than its factorization.

20155797178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245349.

The product of its (nonzero) digits is 1234800, while the sum is 52.

The spelling of 20155797178 in words is "twenty billion, one hundred fifty-five million, seven hundred ninety-seven thousand, one hundred seventy-eight".