1278697332025 has 27 divisors (see below), whose sum is σ = 1657689065389. Its totient is φ = 978381926720.

The previous prime is 1278697331999. The next prime is 1278697332047. The reversal of 1278697332025 is 5202337968721.

The square root of 1278697332025 is 1130795.

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

It can be written as a sum of positive squares in 4 ways, for example, as 18709041961 + 1259988290064 = 136781^2 + 1122492^2 .

It is not a de Polignac number, because 1278697332025 - 2³⁵ = 1244337593657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 130036509 + ... + 130046341.

Almost surely, 2^{1278697332025} is an apocalyptic number.

1278697332025 is the 1130795-th square number.

1278697332025 is the 565398-th centered octagonal number.

It is an amenable number.

1278697332025 is a deficient number, since it is larger than the sum of its proper divisors (378991733364).

1278697332025 is an frugal number, since it uses more digits than its factorization.

1278697332025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19722 (or 9861 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 55.

The spelling of 1278697332025 in words is "one trillion, two hundred seventy-eight billion, six hundred ninety-seven million, three hundred thirty-two thousand, twenty-five".