65831380840 has 32 divisors (see below), whose sum is σ = 148184306280. Its totient is φ = 26321228032.

The previous prime is 65831380793. The next prime is 65831380843. The reversal of 65831380840 is 4808313856.

It can be written as a sum of positive squares in 4 ways, for example, as 48758822596 + 17072558244 = 220814^2 + 130662^2 .

It is a super-2 number, since 2×65831380840² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65831380843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259399 + ... + 446038.

Almost surely, 2^65831380840 is an apocalyptic number.

It is an amenable number.

65831380840 is an abundant number, since it is smaller than the sum of its proper divisors (82352925440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65831380840 is a wasteful number, since it uses less digits than its factorization.

65831380840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707781 (or 707777 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 65831380840 in words is "sixty-five billion, eight hundred thirty-one million, three hundred eighty thousand, eight hundred forty".