79221264649 has 4 divisors (see below), whose sum is σ = 79255021264. Its totient is φ = 79187508036.

The previous prime is 79221264631. The next prime is 79221264667. The reversal of 79221264649 is 94646212297.

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.

It is an interprime number because it is at equal distance from previous prime (79221264631) and next prime (79221264667).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79221264649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79221264596 and 79221264605.

It is not an unprimeable number, because it can be changed into a prime (79221264349) 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, 16874787 + ... + 16879480.

It is an arithmetic number, because the mean of its divisors is an integer number (19813755316).

Almost surely, 2^79221264649 is an apocalyptic number.

It is an amenable number.

79221264649 is a deficient number, since it is larger than the sum of its proper divisors (33756615).

79221264649 is a wasteful number, since it uses less digits than its factorization.

79221264649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33756614.

The product of its digits is 2612736, while the sum is 52.

The spelling of 79221264649 in words is "seventy-nine billion, two hundred twenty-one million, two hundred sixty-four thousand, six hundred forty-nine".