66097839025 has 9 divisors (see below), whose sum is σ = 81962914411. Its totient is φ = 52877242840.

The previous prime is 66097839013. The next prime is 66097839029. The reversal of 66097839025 is 52093879066.

The square root of 66097839025 is 257095.

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

It can be written as a sum of positive squares in only one way, i.e., 23795222049 + 42302616976 = 154257^2 + 205676^2 .

It is not a de Polignac number, because 66097839025 - 2⁵ = 66097838993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66097839029) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1259766 + ... + 1311184.

Almost surely, 2^66097839025 is an apocalyptic number.

66097839025 is the 257095-th square number.

66097839025 is the 128548-th centered octagonal number.

It is an amenable number.

66097839025 is a deficient number, since it is larger than the sum of its proper divisors (15865075386).

66097839025 is an frugal number, since it uses more digits than its factorization.

66097839025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102848 (or 51424 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 66097839025 in words is "sixty-six billion, ninety-seven million, eight hundred thirty-nine thousand, twenty-five".