5651016661 has 4 divisors (see below), whose sum is σ = 5701025772. Its totient is φ = 5601007552.

The previous prime is 5651016649. The next prime is 5651016673. The reversal of 5651016661 is 1666101565.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1666101565 = 5 ⋅333220313.

It is an interprime number because it is at equal distance from previous prime (5651016649) and next prime (5651016673).

It can be written as a sum of positive squares in 2 ways, for example, as 1023616036 + 4627400625 = 31994^2 + 68025^2 .

It is a cyclic number.

It is not a de Polignac number, because 5651016661 - 2¹¹ = 5651014613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5651016661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5651016611) 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, 25004386 + ... + 25004611.

It is an arithmetic number, because the mean of its divisors is an integer number (1425256443).

Almost surely, 2^5651016661 is an apocalyptic number.

It is an amenable number.

5651016661 is a deficient number, since it is larger than the sum of its proper divisors (50009111).

5651016661 is a wasteful number, since it uses less digits than its factorization.

5651016661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50009110.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 5651016661 is about 75173.2443160464. The cubic root of 5651016661 is about 1781.1843169444.

The spelling of 5651016661 in words is "five billion, six hundred fifty-one million, sixteen thousand, six hundred sixty-one".