78990411399025 has 81 divisors (see below), whose sum is σ = 114609861752259. Its totient is φ = 53848097506560.

The previous prime is 78990411399017. The next prime is 78990411399037. The reversal of 78990411399025 is 52099311409987.

The square root of 78990411399025 is 8887655.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 209023610481 + 78781387788544 = 457191^2 + 8875888^2 .

It is not a de Polignac number, because 78990411399025 - 2³ = 78990411399017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 61280380581 + ... + 61280381869.

Almost surely, 2^{78990411399025} is an apocalyptic number.

78990411399025 is the 8887655-th square number.

78990411399025 is the 4443828-th centered octagonal number.

It is an amenable number.

78990411399025 is a deficient number, since it is larger than the sum of its proper divisors (35619450353234).

78990411399025 is an frugal number, since it uses more digits than its factorization.

78990411399025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2996 (or 1498 counting only the distinct ones).

The product of its (nonzero) digits is 44089920, while the sum is 67.

The spelling of 78990411399025 in words is "seventy-eight trillion, nine hundred ninety billion, four hundred eleven million, three hundred ninety-nine thousand, twenty-five".