16650631878 has 32 divisors (see below), whose sum is σ = 35439189984. Its totient is φ = 5197204992.

The previous prime is 16650631873. The next prime is 16650631897. The reversal of 16650631878 is 87813605661.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16650631878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16650631873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394225 + ... + 434412.

It is an arithmetic number, because the mean of its divisors is an integer number (1107474687).

Almost surely, 2^16650631878 is an apocalyptic number.

16650631878 is an abundant number, since it is smaller than the sum of its proper divisors (18788558106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16650631878 is a wasteful number, since it uses less digits than its factorization.

16650631878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828856.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 16650631878 in words is "sixteen billion, six hundred fifty million, six hundred thirty-one thousand, eight hundred seventy-eight".