66656560258 has 4 divisors (see below), whose sum is σ = 99984840390. Its totient is φ = 33328280128.

The previous prime is 66656560241. The next prime is 66656560273. The reversal of 66656560258 is 85206565666.

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

It can be written as a sum of positive squares in only one way, i.e., 46266719409 + 20389840849 = 215097^2 + 142793^2 .

It is a super-4 number, since 4×66656560258⁴ (a number of 44 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66656560199 and 66656560208.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16664140063 + ... + 16664140066.

Almost surely, 2^66656560258 is an apocalyptic number.

66656560258 is a deficient number, since it is larger than the sum of its proper divisors (33328280132).

66656560258 is a wasteful number, since it uses less digits than its factorization.

66656560258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33328280131.

The product of its (nonzero) digits is 15552000, while the sum is 55.

The spelling of 66656560258 in words is "sixty-six billion, six hundred fifty-six million, five hundred sixty thousand, two hundred fifty-eight".