1664560451 has 8 divisors (see below), whose sum is σ = 1693411440. Its totient is φ = 1635730848.

The previous prime is 1664560397. The next prime is 1664560459. The reversal of 1664560451 is 1540654661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1664560451 is a prime.

It is a super-2 number, since 2×1664560451² = 5541522990066646802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664560459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296765 + ... + 302321.

It is an arithmetic number, because the mean of its divisors is an integer number (211676430).

Almost surely, 2^1664560451 is an apocalyptic number.

1664560451 is a deficient number, since it is larger than the sum of its proper divisors (28850989).

1664560451 is an equidigital number, since it uses as much as digits as its factorization.

1664560451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10693.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 1664560451 is about 40799.0251231570. The cubic root of 1664560451 is about 1185.1314520035.

The spelling of 1664560451 in words is "one billion, six hundred sixty-four million, five hundred sixty thousand, four hundred fifty-one".