78216342448377 has 32 divisors (see below), whose sum is σ = 119342470396672. Its totient is φ = 44636706422784.

The previous prime is 78216342448369. The next prime is 78216342448399. The reversal of 78216342448377 is 77384424361287.

It is a happy number.

It is not a de Polignac number, because 78216342448377 - 2³ = 78216342448369 is a prime.

It is a super-2 number, since 2×78216342448377² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78216342448357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68800473 + ... + 69928089.

It is an arithmetic number, because the mean of its divisors is an integer number (3729452199896).

Almost surely, 2^{78216342448377} is an apocalyptic number.

It is an amenable number.

78216342448377 is a deficient number, since it is larger than the sum of its proper divisors (41126127948295).

78216342448377 is a wasteful number, since it uses less digits than its factorization.

78216342448377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131937.

The product of its digits is 303464448, while the sum is 66.

The spelling of 78216342448377 in words is "seventy-eight trillion, two hundred sixteen billion, three hundred forty-two million, four hundred forty-eight thousand, three hundred seventy-seven".