65648772890 has 8 divisors (see below), whose sum is σ = 118167791220. Its totient is φ = 26259509152.

The previous prime is 65648772853. The next prime is 65648772899. The reversal of 65648772890 is 9827784656.

It can be written as a sum of positive squares in 2 ways, for example, as 61435075321 + 4213697569 = 247861^2 + 64913^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×65648772890² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65648772899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3282438635 + ... + 3282438654.

Almost surely, 2^65648772890 is an apocalyptic number.

65648772890 is a deficient number, since it is larger than the sum of its proper divisors (52519018330).

65648772890 is a wasteful number, since it uses less digits than its factorization.

65648772890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6564877296.

The product of its (nonzero) digits is 40642560, while the sum is 62.

The spelling of 65648772890 in words is "sixty-five billion, six hundred forty-eight million, seven hundred seventy-two thousand, eight hundred ninety".