3636721465 has 8 divisors (see below), whose sum is σ = 4699763208. Its totient is φ = 2685578880.

The previous prime is 3636721427. The next prime is 3636721477. The reversal of 3636721465 is 5641276363.

It can be written as a sum of positive squares in 4 ways, for example, as 61638201 + 3575083264 = 7851^2 + 59792^2 .

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

It is not a de Polignac number, because 3636721465 - 2¹³ = 3636713273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 27974716 + ... + 27974845.

It is an arithmetic number, because the mean of its divisors is an integer number (587470401).

Almost surely, 2^3636721465 is an apocalyptic number.

It is an amenable number.

3636721465 is a deficient number, since it is larger than the sum of its proper divisors (1063041743).

3636721465 is a wasteful number, since it uses less digits than its factorization.

3636721465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55949579.

The product of its digits is 544320, while the sum is 43.

The square root of 3636721465 is about 60305.2358008822. The cubic root of 3636721465 is about 1537.8123580675.

The spelling of 3636721465 in words is "three billion, six hundred thirty-six million, seven hundred twenty-one thousand, four hundred sixty-five".