77120678251 has 4 divisors (see below), whose sum is σ = 77161723600. Its totient is φ = 77079632904.

The previous prime is 77120678221. The next prime is 77120678263. The reversal of 77120678251 is 15287602177.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77120678251 - 2⁷ = 77120678123 is a prime.

It is a super-3 number, since 3×77120678251³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77120678221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20519856 + ... + 20523613.

It is an arithmetic number, because the mean of its divisors is an integer number (19290430900).

Almost surely, 2^77120678251 is an apocalyptic number.

77120678251 is a deficient number, since it is larger than the sum of its proper divisors (41045349).

77120678251 is a wasteful number, since it uses less digits than its factorization.

77120678251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41045348.

The product of its (nonzero) digits is 329280, while the sum is 46.

The spelling of 77120678251 in words is "seventy-seven billion, one hundred twenty million, six hundred seventy-eight thousand, two hundred fifty-one".