1664001407 has 4 divisors (see below), whose sum is σ = 1708974456. Its totient is φ = 1619028360.

The previous prime is 1664001397. The next prime is 1664001439. The reversal of 1664001407 is 7041004661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1664001407 - 2⁶ = 1664001343 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 1664001407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664001467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22486469 + ... + 22486542.

It is an arithmetic number, because the mean of its divisors is an integer number (427243614).

Almost surely, 2^1664001407 is an apocalyptic number.

1664001407 is a deficient number, since it is larger than the sum of its proper divisors (44973049).

1664001407 is an equidigital number, since it uses as much as digits as its factorization.

1664001407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44973048.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1664001407 is about 40792.1733547013. The cubic root of 1664001407 is about 1184.9987613558.

The spelling of 1664001407 in words is "one billion, six hundred sixty-four million, one thousand, four hundred seven".