1664554325 has 48 divisors (see below), whose sum is σ = 2449128960. Its totient is φ = 1098048000.

The previous prime is 1664554301. The next prime is 1664554327. The reversal of 1664554325 is 5234554661.

It is a happy number.

It is not a de Polignac number, because 1664554325 - 2⁸ = 1664554069 is a prime.

It is a super-2 number, since 2×1664554325² = 5541482201752411250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664554327) 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, 2186945 + ... + 2187705.

It is an arithmetic number, because the mean of its divisors is an integer number (51023520).

Almost surely, 2^1664554325 is an apocalyptic number.

It is an amenable number.

1664554325 is a deficient number, since it is larger than the sum of its proper divisors (784574635).

1664554325 is a wasteful number, since it uses less digits than its factorization.

1664554325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238 (or 1233 counting only the distinct ones).

The product of its digits is 432000, while the sum is 41.

The square root of 1664554325 is about 40798.9500477647. The cubic root of 1664554325 is about 1185.1299981413.

The spelling of 1664554325 in words is "one billion, six hundred sixty-four million, five hundred fifty-four thousand, three hundred twenty-five".