6981987099025 has 9 divisors (see below), whose sum is σ = 8657680385361. Its totient is φ = 5585579109840.

The previous prime is 6981987098987. The next prime is 6981987099121. The reversal of 6981987099025 is 5209907891896.

The square root of 6981987099025 is 2642345.

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 3842513414289 + 3139473684736 = 1960233^2 + 1771856^2 .

It is not a de Polignac number, because 6981987099025 - 2¹¹ = 6981987096977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12947491 + ... + 13475959.

Almost surely, 2^{6981987099025} is an apocalyptic number.

6981987099025 is the 2642345-th square number.

6981987099025 is the 1321173-rd centered octagonal number.

It is an amenable number.

6981987099025 is a deficient number, since it is larger than the sum of its proper divisors (1675693286336).

6981987099025 is an frugal number, since it uses more digits than its factorization.

6981987099025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056948 (or 528474 counting only the distinct ones).

The product of its (nonzero) digits is 176359680, while the sum is 73.

The spelling of 6981987099025 in words is "six trillion, nine hundred eighty-one billion, nine hundred eighty-seven million, ninety-nine thousand, twenty-five".