77918946551 has 4 divisors (see below), whose sum is σ = 79819408704. Its totient is φ = 76018484400.

The previous prime is 77918946529. The next prime is 77918946557. The reversal of 77918946551 is 15564981977.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15564981977 = 5741 ⋅2711197.

It is a cyclic number.

It is not a de Polignac number, because 77918946551 - 2¹⁸ = 77918684407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77918946557) 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, 950231015 + ... + 950231096.

It is an arithmetic number, because the mean of its divisors is an integer number (19954852176).

Almost surely, 2^77918946551 is an apocalyptic number.

77918946551 is a deficient number, since it is larger than the sum of its proper divisors (1900462153).

77918946551 is a wasteful number, since it uses less digits than its factorization.

77918946551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900462152.

The product of its digits is 19051200, while the sum is 62.

The spelling of 77918946551 in words is "seventy-seven billion, nine hundred eighteen million, nine hundred forty-six thousand, five hundred fifty-one".