77949967937 has 4 divisors (see below), whose sum is σ = 78033159876. Its totient is φ = 77866776000.

The previous prime is 77949967873. The next prime is 77949967939. The reversal of 77949967937 is 73976994977.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73976994977 = 197 ⋅375517741.

It can be written as a sum of positive squares in 2 ways, for example, as 31812646321 + 46137321616 = 178361^2 + 214796^2 .

It is a cyclic number.

It is not a de Polignac number, because 77949967937 - 2⁶ = 77949967873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77949967939) 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, 41594564 + ... + 41596437.

It is an arithmetic number, because the mean of its divisors is an integer number (19508289969).

Almost surely, 2^77949967937 is an apocalyptic number.

It is an amenable number.

77949967937 is a deficient number, since it is larger than the sum of its proper divisors (83191939).

77949967937 is an equidigital number, since it uses as much as digits as its factorization.

77949967937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83191938.

The product of its digits is 1134213192, while the sum is 77.

The spelling of 77949967937 in words is "seventy-seven billion, nine hundred forty-nine million, nine hundred sixty-seven thousand, nine hundred thirty-seven".