7647766949 has 4 divisors (see below), whose sum is σ = 7655171436. Its totient is φ = 7640362464.

The previous prime is 7647766943. The next prime is 7647766957. The reversal of 7647766949 is 9496677467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9496677467 = 42703 ⋅222389.

It can be written as a sum of positive squares in 2 ways, for example, as 5562474724 + 2085292225 = 74582^2 + 45665^2 .

It is a cyclic number.

It is not a de Polignac number, because 7647766949 - 2¹² = 7647762853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7647766943) 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, 3700694 + ... + 3702759.

It is an arithmetic number, because the mean of its divisors is an integer number (1913792859).

Almost surely, 2^7647766949 is an apocalyptic number.

It is an amenable number.

7647766949 is a deficient number, since it is larger than the sum of its proper divisors (7404487).

7647766949 is a wasteful number, since it uses less digits than its factorization.

7647766949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7404486.

The product of its digits is 96018048, while the sum is 65.

The square root of 7647766949 is about 87451.5119880726. The cubic root of 7647766949 is about 1970.2055965692.

The spelling of 7647766949 in words is "seven billion, six hundred forty-seven million, seven hundred sixty-six thousand, nine hundred forty-nine".