7878464388825 has 24 divisors (see below), whose sum is σ = 13113148800000. Its totient is φ = 4173647348160.

The previous prime is 7878464388799. The next prime is 7878464388913. The reversal of 7878464388825 is 5288834648787.

It is not a de Polignac number, because 7878464388825 - 2¹² = 7878464384729 is a prime.

It is a super-2 number, since 2×7878464388825² (a number of 27 digits) contains 22 as substring.

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, 352492825 + ... + 352515174.

It is an arithmetic number, because the mean of its divisors is an integer number (546381200000).

Almost surely, 2^{7878464388825} is an apocalyptic number.

7878464388825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

7878464388825 is a deficient number, since it is larger than the sum of its proper divisors (5234684411175).

7878464388825 is a wasteful number, since it uses less digits than its factorization.

7878464388825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705008161 (or 705008156 counting only the distinct ones).

The product of its digits is 4624220160, while the sum is 78.

The spelling of 7878464388825 in words is "seven trillion, eight hundred seventy-eight billion, four hundred sixty-four million, three hundred eighty-eight thousand, eight hundred twenty-five".