510661556651 has 4 divisors (see below), whose sum is σ = 512404429152. Its totient is φ = 508918684152.

The previous prime is 510661556621. The next prime is 510661556659. The reversal of 510661556651 is 156655166015.

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

It is a cyclic number.

It is not a de Polignac number, because 510661556651 - 2¹⁴ = 510661540267 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 510661556596 and 510661556605.

It is not an unprimeable number, because it can be changed into a prime (510661556659) 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, 871435811 + ... + 871436396.

It is an arithmetic number, because the mean of its divisors is an integer number (128101107288).

Almost surely, 2^510661556651 is an apocalyptic number.

510661556651 is a deficient number, since it is larger than the sum of its proper divisors (1742872501).

510661556651 is a wasteful number, since it uses less digits than its factorization.

510661556651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1742872500.

The product of its (nonzero) digits is 810000, while the sum is 47.

The spelling of 510661556651 in words is "five hundred ten billion, six hundred sixty-one million, five hundred fifty-six thousand, six hundred fifty-one".