17561312051 has 4 divisors (see below), whose sum is σ = 17571400704. Its totient is φ = 17551223400.

The previous prime is 17561312023. The next prime is 17561312053. The reversal of 17561312051 is 15021316571.

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 17561312051 - 2⁶ = 17561311987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17561311999 and 17561312017.

It is not an unprimeable number, because it can be changed into a prime (17561312053) 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, 5041715 + ... + 5045196.

It is an arithmetic number, because the mean of its divisors is an integer number (4392850176).

Almost surely, 2^17561312051 is an apocalyptic number.

17561312051 is a deficient number, since it is larger than the sum of its proper divisors (10088653).

17561312051 is a wasteful number, since it uses less digits than its factorization.

17561312051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10088652.

The product of its (nonzero) digits is 6300, while the sum is 32.

The spelling of 17561312051 in words is "seventeen billion, five hundred sixty-one million, three hundred twelve thousand, fifty-one".