654902679817 has 4 divisors (see below), whose sum is σ = 654964537860. Its totient is φ = 654840821776.

The previous prime is 654902679787. The next prime is 654902679829. The reversal of 654902679817 is 718976209456.

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 137573486281 + 517329193536 = 370909^2 + 719256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-654902679817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654902679877) 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, 30913138 + ... + 30934315.

It is an arithmetic number, because the mean of its divisors is an integer number (163741134465).

Almost surely, 2^654902679817 is an apocalyptic number.

It is an amenable number.

654902679817 is a deficient number, since it is larger than the sum of its proper divisors (61858043).

654902679817 is a wasteful number, since it uses less digits than its factorization.

654902679817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61858042.

The product of its (nonzero) digits is 45722880, while the sum is 64.

The spelling of 654902679817 in words is "six hundred fifty-four billion, nine hundred two million, six hundred seventy-nine thousand, eight hundred seventeen".