78734614457825 has 24 divisors (see below), whose sum is σ = 97835065472760. Its totient is φ = 62856114048000.

The previous prime is 78734614457771. The next prime is 78734614457861. The reversal of 78734614457825 is 52875441643787.

It can be written as a sum of positive squares in 12 ways, for example, as 51117109042129 + 27617505415696 = 7149623^2 + 5255236^2 .

It is not a de Polignac number, because 78734614457825 - 2¹⁸ = 78734614195681 is a prime.

It is a Smith number, since the sum of its digits (71) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23022521 + ... + 26220329.

It is an arithmetic number, because the mean of its divisors is an integer number (4076461061365).

Almost surely, 2^{78734614457825} is an apocalyptic number.

It is an amenable number.

78734614457825 is a deficient number, since it is larger than the sum of its proper divisors (19100451014935).

78734614457825 is a wasteful number, since it uses less digits than its factorization.

78734614457825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3199877 (or 3199872 counting only the distinct ones).

The product of its digits is 1264435200, while the sum is 71.

The spelling of 78734614457825 in words is "seventy-eight trillion, seven hundred thirty-four billion, six hundred fourteen million, four hundred fifty-seven thousand, eight hundred twenty-five".