66514989025 has 9 divisors (see below), whose sum is σ = 82480185433. Its totient is φ = 53210959600.

The previous prime is 66514989011. The next prime is 66514989031. The reversal of 66514989025 is 52098941566.

The square root of 66514989025 is 257905.

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 38121391009 + 28393598016 = 195247^2 + 168504^2 .

It is not a de Polignac number, because 66514989025 - 2⁵ = 66514988993 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, 1263735 + ... + 1315315.

Almost surely, 2^66514989025 is an apocalyptic number.

66514989025 is the 257905-th square number.

66514989025 is the 128953-rd centered octagonal number.

It is an amenable number.

66514989025 is a deficient number, since it is larger than the sum of its proper divisors (15965196408).

66514989025 is an frugal number, since it uses more digits than its factorization.

66514989025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103172 (or 51586 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 66514989025 in words is "sixty-six billion, five hundred fourteen million, nine hundred eighty-nine thousand, twenty-five".