9977777650 has 12 divisors (see below), whose sum is σ = 18558666522. Its totient is φ = 3991111040.

The previous prime is 9977777633. The next prime is 9977777651. The reversal of 9977777650 is 567777799.

It can be written as a sum of positive squares in 3 ways, for example, as 7167823569 + 2809954081 = 84663^2 + 53009^2 .

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9977777651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 99777727 + ... + 99777826.

Almost surely, 2^9977777650 is an apocalyptic number.

9977777650 is a deficient number, since it is larger than the sum of its proper divisors (8580888872).

9977777650 is a wasteful number, since it uses less digits than its factorization.

9977777650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199555565 (or 199555560 counting only the distinct ones).

The product of its (nonzero) digits is 40841010, while the sum is 64.

The square root of 9977777650 is about 99888.8264522114. The cubic root of 9977777650 is about 2152.8376197007.

The spelling of 9977777650 in words is "nine billion, nine hundred seventy-seven million, seven hundred seventy-seven thousand, six hundred fifty".