664425654123 has 48 divisors (see below), whose sum is σ = 1135354199040. Its totient is φ = 341738712000.

The previous prime is 664425654121. The next prime is 664425654197. The reversal of 664425654123 is 321456524466.

It is not a de Polignac number, because 664425654123 - 2¹ = 664425654121 is a prime.

It is a super-2 number, since 2×664425654123² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664425654121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1870843 + ... + 2197476.

It is an arithmetic number, because the mean of its divisors is an integer number (23653212480).

Almost surely, 2^664425654123 is an apocalyptic number.

664425654123 is a deficient number, since it is larger than the sum of its proper divisors (470928544917).

664425654123 is a wasteful number, since it uses less digits than its factorization.

664425654123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4068448 (or 4068441 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 48.

The spelling of 664425654123 in words is "six hundred sixty-four billion, four hundred twenty-five million, six hundred fifty-four thousand, one hundred twenty-three".