65660475049 has 27 divisors (see below), whose sum is σ = 74412333093. Its totient is φ = 57906818112.

The previous prime is 65660475031. The next prime is 65660475107. The reversal of 65660475049 is 94057406656.

It is a happy number.

The square root of 65660475049 is 256243.

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 951290649 + 64709184400 = 30843^2 + 254380^2 .

It is not a de Polignac number, because 65660475049 - 2¹³ = 65660466857 is a prime.

It is a super-2 number, since 2×65660475049² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65660474987 and 65660475005.

It is not an unprimeable number, because it can be changed into a prime (65660475029) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 76616229 + ... + 76617085.

Almost surely, 2^65660475049 is an apocalyptic number.

65660475049 is the 256243-rd square number.

65660475049 is the 128122-nd centered octagonal number.

It is an amenable number.

65660475049 is a deficient number, since it is larger than the sum of its proper divisors (8751858044).

65660475049 is an frugal number, since it uses more digits than its factorization.

65660475049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786 (or 893 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 52.

The spelling of 65660475049 in words is "sixty-five billion, six hundred sixty million, four hundred seventy-five thousand, forty-nine".