66100500650 has 12 divisors (see below), whose sum is σ = 122946931302. Its totient is φ = 26440200240.

The previous prime is 66100500649. The next prime is 66100500667. The reversal of 66100500650 is 5600500166.

It can be written as a sum of positive squares in 3 ways, for example, as 39210732289 + 26889768361 = 198017^2 + 163981^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 661004957 + ... + 661005056.

Almost surely, 2^66100500650 is an apocalyptic number.

66100500650 is a deficient number, since it is larger than the sum of its proper divisors (56846430652).

66100500650 is a wasteful number, since it uses less digits than its factorization.

66100500650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322010025 (or 1322010020 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The spelling of 66100500650 in words is "sixty-six billion, one hundred million, five hundred thousand, six hundred fifty".