2154520667 has 6 divisors (see below), whose sum is σ = 2333001852. Its totient is φ = 1988788152.

The previous prime is 2154520661. The next prime is 2154520679. The reversal of 2154520667 is 7660254512.

It is not a de Polignac number, because 2154520667 - 2⁴ = 2154520651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2154520667.

It is not an unprimeable number, because it can be changed into a prime (2154520661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6374153 + ... + 6374490.

It is an arithmetic number, because the mean of its divisors is an integer number (388833642).

Almost surely, 2^2154520667 is an apocalyptic number.

2154520667 is a deficient number, since it is larger than the sum of its proper divisors (178481185).

2154520667 is a wasteful number, since it uses less digits than its factorization.

2154520667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12748669 (or 12748656 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 2154520667 is about 46416.8144857012. The cubic root of 2154520667 is about 1291.5668453991.

The spelling of 2154520667 in words is "two billion, one hundred fifty-four million, five hundred twenty thousand, six hundred sixty-seven".