53415671665 has 4 divisors (see below), whose sum is σ = 64098806004. Its totient is φ = 42732537328.

The previous prime is 53415671651. The next prime is 53415671669. The reversal of 53415671665 is 56617651435.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12424000369 + 40991671296 = 111463^2 + 202464^2 .

It is a cyclic number.

It is not a de Polignac number, because 53415671665 - 2¹¹ = 53415669617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53415671669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5341567162 + ... + 5341567171.

It is an arithmetic number, because the mean of its divisors is an integer number (16024701501).

Almost surely, 2^53415671665 is an apocalyptic number.

It is an amenable number.

53415671665 is a deficient number, since it is larger than the sum of its proper divisors (10683134339).

53415671665 is a wasteful number, since it uses less digits than its factorization.

53415671665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10683134338.

The product of its digits is 2268000, while the sum is 49.

The spelling of 53415671665 in words is "fifty-three billion, four hundred fifteen million, six hundred seventy-one thousand, six hundred sixty-five".