78247651515825 has 48 divisors (see below), whose sum is σ = 141188559353856. Its totient is φ = 37922596756800.

The previous prime is 78247651515809. The next prime is 78247651515871. The reversal of 78247651515825 is 52851515674287.

It is not a de Polignac number, because 78247651515825 - 2⁴ = 78247651515809 is a prime.

It is a super-2 number, since 2×78247651515825² (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 47 ways as a sum of consecutive naturals, for example, 17572969 + ... + 21570918.

It is an arithmetic number, because the mean of its divisors is an integer number (2941428319872).

Almost surely, 2^{78247651515825} is an apocalyptic number.

78247651515825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78247651515825 is a deficient number, since it is larger than the sum of its proper divisors (62940907838031).

78247651515825 is a wasteful number, since it uses less digits than its factorization.

78247651515825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39146334 (or 39146329 counting only the distinct ones).

The product of its digits is 188160000, while the sum is 66.

The spelling of 78247651515825 in words is "seventy-eight trillion, two hundred forty-seven billion, six hundred fifty-one million, five hundred fifteen thousand, eight hundred twenty-five".