78148471450778 has 8 divisors (see below), whose sum is σ = 117222938710068. Its totient is φ = 39074158547424.

The previous prime is 78148471450729. The next prime is 78148471450811. The reversal of 78148471450778 is 87705417484187.

It can be written as a sum of positive squares in 2 ways, for example, as 75078291141529 + 3070180309249 = 8664773^2 + 1752193^2 .

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

It is a super-2 number, since 2×78148471450778² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37314851 + ... + 39353462.

Almost surely, 2^{78148471450778} is an apocalyptic number.

78148471450778 is a deficient number, since it is larger than the sum of its proper divisors (39074467259290).

78148471450778 is a wasteful number, since it uses less digits than its factorization.

78148471450778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77177968.

The product of its (nonzero) digits is 393379840, while the sum is 71.

The spelling of 78148471450778 in words is "seventy-eight trillion, one hundred forty-eight billion, four hundred seventy-one million, four hundred fifty thousand, seven hundred seventy-eight".