77705888249 has 4 divisors (see below), whose sum is σ = 84770059920. Its totient is φ = 70641716580.

The previous prime is 77705888231. The next prime is 77705888257. The reversal of 77705888249 is 94288850777.

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 an emirpimes, since its reverse is a distinct semiprime: 94288850777 = 11 ⋅8571713707.

It is a cyclic number.

It is not a de Polignac number, because 77705888249 - 2⁸ = 77705887993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77705888549) 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, 3532085819 + ... + 3532085840.

It is an arithmetic number, because the mean of its divisors is an integer number (21192514980).

Almost surely, 2^77705888249 is an apocalyptic number.

It is an amenable number.

77705888249 is a deficient number, since it is larger than the sum of its proper divisors (7064171671).

77705888249 is a wasteful number, since it uses less digits than its factorization.

77705888249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7064171670.

The product of its (nonzero) digits is 63221760, while the sum is 65.

The spelling of 77705888249 in words is "seventy-seven billion, seven hundred five million, eight hundred eighty-eight thousand, two hundred forty-nine".