77121251077 has 16 divisors (see below), whose sum is σ = 88093317312. Its totient is φ = 66883818240.

The previous prime is 77121251059. The next prime is 77121251089. The reversal of 77121251077 is 77015212177.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77121251077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77121251057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179383 + ... + 431764.

It is an arithmetic number, because the mean of its divisors is an integer number (5505832332).

Almost surely, 2^77121251077 is an apocalyptic number.

It is an amenable number.

77121251077 is a deficient number, since it is larger than the sum of its proper divisors (10972066235).

77121251077 is a wasteful number, since it uses less digits than its factorization.

77121251077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611748.

The product of its (nonzero) digits is 48020, while the sum is 40.

The spelling of 77121251077 in words is "seventy-seven billion, one hundred twenty-one million, two hundred fifty-one thousand, seventy-seven".