5151660661 has 4 divisors (see below), whose sum is σ = 5887612192. Its totient is φ = 4415709132.

The previous prime is 5151660629. The next prime is 5151660667. The reversal of 5151660661 is 1660661515.

5151660661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1660661515 = 5 ⋅332132303.

It is a cyclic number.

It is not a de Polignac number, because 5151660661 - 2⁵ = 5151660629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5151660661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5151660667) 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, 367975755 + ... + 367975768.

It is an arithmetic number, because the mean of its divisors is an integer number (1471903048).

Almost surely, 2^5151660661 is an apocalyptic number.

It is an amenable number.

5151660661 is a deficient number, since it is larger than the sum of its proper divisors (735951531).

5151660661 is an equidigital number, since it uses as much as digits as its factorization.

5151660661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735951530.

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

The square root of 5151660661 is about 71775.0699128883. The cubic root of 5151660661 is about 1727.0931014240.

The spelling of 5151660661 in words is "five billion, one hundred fifty-one million, six hundred sixty thousand, six hundred sixty-one".