77978879750015 has 8 divisors (see below), whose sum is σ = 93587557254048. Its totient is φ = 62374502764000.

The previous prime is 77978879750011. The next prime is 77978879750033. The reversal of 77978879750015 is 51005797887977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77978879750015 - 2² = 77978879750011 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 (77978879750011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1075089611 + ... + 1075162140.

It is an arithmetic number, because the mean of its divisors is an integer number (11698444656756).

Almost surely, 2^{77978879750015} is an apocalyptic number.

77978879750015 is a deficient number, since it is larger than the sum of its proper divisors (15608677504033).

77978879750015 is a wasteful number, since it uses less digits than its factorization.

77978879750015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150259009.

The product of its (nonzero) digits is 2178187200, while the sum is 80.

The spelling of 77978879750015 in words is "seventy-seven trillion, nine hundred seventy-eight billion, eight hundred seventy-nine million, seven hundred fifty thousand, fifteen".