5213736665 has 4 divisors (see below), whose sum is σ = 6256484004. Its totient is φ = 4170989328.

The previous prime is 5213736631. The next prime is 5213736701. The reversal of 5213736665 is 5666373125.

It is a happy number.

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 2550351001 + 2663385664 = 50501^2 + 51608^2 .

It is a cyclic number.

It is not a de Polignac number, because 5213736665 - 2²² = 5209542361 is a prime.

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, 521373662 + ... + 521373671.

It is an arithmetic number, because the mean of its divisors is an integer number (1564121001).

Almost surely, 2^5213736665 is an apocalyptic number.

It is an amenable number.

5213736665 is a deficient number, since it is larger than the sum of its proper divisors (1042747339).

5213736665 is a wasteful number, since it uses less digits than its factorization.

5213736665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042747338.

The product of its digits is 680400, while the sum is 44.

The square root of 5213736665 is about 72206.2093244064. The cubic root of 5213736665 is about 1734.0024124527.

The spelling of 5213736665 in words is "five billion, two hundred thirteen million, seven hundred thirty-six thousand, six hundred sixty-five".