78148471450777 has 48 divisors (see below), whose sum is σ = 102750029763840. Its totient is φ = 58086123653376.

The previous prime is 78148471450729. The next prime is 78148471450811. The reversal of 78148471450777 is 77705417484187.

It is not a de Polignac number, because 78148471450777 - 2³⁹ = 77598715636889 is a prime.

It is a super-2 number, since 2×78148471450777² (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 (78148471450717) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29513293 + ... + 32052010.

It is an arithmetic number, because the mean of its divisors is an integer number (2140625620080).

Almost surely, 2^{78148471450777} is an apocalyptic number.

It is an amenable number.

78148471450777 is a deficient number, since it is larger than the sum of its proper divisors (24601558313063).

78148471450777 is a wasteful number, since it uses less digits than its factorization.

78148471450777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61565402 (or 61565389 counting only the distinct ones).

The product of its (nonzero) digits is 344207360, while the sum is 70.

The spelling of 78148471450777 in words is "seventy-eight trillion, one hundred forty-eight billion, four hundred seventy-one million, four hundred fifty thousand, seven hundred seventy-seven".