2151643788 has 36 divisors (see below), whose sum is σ = 6215860560. Its totient is φ = 614755296.

The previous prime is 2151643783. The next prime is 2151643799. The reversal of 2151643788 is 8873461512.

2151643788 is a `hidden beast` number, since 21 + 516 + 4 + 37 + 88 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (2151643783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4268883 + ... + 4269386.

Almost surely, 2^2151643788 is an apocalyptic number.

2151643788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2151643788 is an abundant number, since it is smaller than the sum of its proper divisors (4064216772).

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

2151643788 is a wasteful number, since it uses less digits than its factorization.

2151643788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8538286 (or 8538281 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 2151643788 is about 46385.8145126288. The cubic root of 2151643788 is about 1290.9917234181.

The spelling of 2151643788 in words is "two billion, one hundred fifty-one million, six hundred forty-three thousand, seven hundred eighty-eight".