5211750661 has 4 divisors (see below), whose sum is σ = 5612654572. Its totient is φ = 4810846752.

The previous prime is 5211750653. The next prime is 5211750683. The reversal of 5211750661 is 1660571125.

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 987530625 + 4224220036 = 31425^2 + 64994^2 .

It is a cyclic number.

It is not a de Polignac number, because 5211750661 - 2³ = 5211750653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5211750611) 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, 200451936 + ... + 200451961.

It is an arithmetic number, because the mean of its divisors is an integer number (1403163643).

Almost surely, 2^5211750661 is an apocalyptic number.

It is an amenable number.

5211750661 is a deficient number, since it is larger than the sum of its proper divisors (400903911).

5211750661 is a wasteful number, since it uses less digits than its factorization.

5211750661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400903910.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 5211750661 is about 72192.4557069504. The cubic root of 5211750661 is about 1733.7822138184.

The spelling of 5211750661 in words is "five billion, two hundred eleven million, seven hundred fifty thousand, six hundred sixty-one".