650138777 has 4 divisors (see below), whose sum is σ = 650192400. Its totient is φ = 650085156.

The previous prime is 650138767. The next prime is 650138807. The reversal of 650138777 is 777831056.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 650138777 - 2⁸ = 650138521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650138767) 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, 974 + ... + 36072.

It is an arithmetic number, because the mean of its divisors is an integer number (162548100).

Almost surely, 2^650138777 is an apocalyptic number.

It is an amenable number.

650138777 is a deficient number, since it is larger than the sum of its proper divisors (53623).

650138777 is a wasteful number, since it uses less digits than its factorization.

650138777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53622.

The product of its (nonzero) digits is 246960, while the sum is 44.

The square root of 650138777 is about 25497.8190635984. The cubic root of 650138777 is about 866.3007491922.

The spelling of 650138777 in words is "six hundred fifty million, one hundred thirty-eight thousand, seven hundred seventy-seven".