1351664065 has 4 divisors (see below), whose sum is σ = 1621996884. Its totient is φ = 1081331248.

The previous prime is 1351664059. The next prime is 1351664071. The reversal of 1351664065 is 5604661531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5604661531 = 7 ⋅800665933.

It is an interprime number because it is at equal distance from previous prime (1351664059) and next prime (1351664071).

It can be written as a sum of positive squares in 2 ways, for example, as 277922241 + 1073741824 = 16671^2 + 32768^2 .

It is a cyclic number.

It is not a de Polignac number, because 1351664065 - 2¹⁷ = 1351532993 is a prime.

It is a super-2 number, since 2×1351664065² = 3653991489224648450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135166402 + ... + 135166411.

It is an arithmetic number, because the mean of its divisors is an integer number (405499221).

Almost surely, 2^1351664065 is an apocalyptic number.

It is an amenable number.

1351664065 is a deficient number, since it is larger than the sum of its proper divisors (270332819).

1351664065 is an equidigital number, since it uses as much as digits as its factorization.

1351664065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270332818.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 1351664065 is about 36764.9842241228. The cubic root of 1351664065 is about 1105.6633718670.

The spelling of 1351664065 in words is "one billion, three hundred fifty-one million, six hundred sixty-four thousand, sixty-five".