664154402 has 16 divisors (see below), whose sum is σ = 1057146552. Its totient is φ = 311857920.

The previous prime is 664154399. The next prime is 664154423. The reversal of 664154402 is 204451466.

It can be written as a sum of positive squares in 4 ways, for example, as 446857321 + 217297081 = 21139^2 + 14741^2 .

It is a super-2 number, since 2×664154402² = 882202139391955208, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5513 + ... + 36860.

Almost surely, 2^664154402 is an apocalyptic number.

664154402 is a deficient number, since it is larger than the sum of its proper divisors (392992150).

664154402 is a wasteful number, since it uses less digits than its factorization.

664154402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42853.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 664154402 is about 25771.1932591411. The cubic root of 664154402 is about 872.4817507807.

The spelling of 664154402 in words is "six hundred sixty-four million, one hundred fifty-four thousand, four hundred two".