1664251455 has 16 divisors (see below), whose sum is σ = 2663976960. Its totient is φ = 887209248.

The previous prime is 1664251429. The next prime is 1664251481. The reversal of 1664251455 is 5541524661.

It is an interprime number because it is at equal distance from previous prime (1664251429) and next prime (1664251481).

It is not a de Polignac number, because 1664251455 - 2⁹ = 1664250943 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12466 + ... + 59024.

It is an arithmetic number, because the mean of its divisors is an integer number (166498560).

Almost surely, 2^1664251455 is an apocalyptic number.

1664251455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1664251455 is a deficient number, since it is larger than the sum of its proper divisors (999725505).

1664251455 is a wasteful number, since it uses less digits than its factorization.

1664251455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48950.

The product of its digits is 144000, while the sum is 39.

The square root of 1664251455 is about 40795.2381412341. The cubic root of 1664251455 is about 1185.0581146168.

The spelling of 1664251455 in words is "one billion, six hundred sixty-four million, two hundred fifty-one thousand, four hundred fifty-five".