65680018420 has 24 divisors (see below), whose sum is σ = 137938695048. Its totient is φ = 26269977600.

The previous prime is 65680018399. The next prime is 65680018433. The reversal of 65680018420 is 2481008656.

It can be written as a sum of positive squares in 4 ways, for example, as 4566245476 + 61113772944 = 67574^2 + 247212^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153600 + ... + 393640.

It is an arithmetic number, because the mean of its divisors is an integer number (5747445627).

Almost surely, 2^65680018420 is an apocalyptic number.

It is an amenable number.

65680018420 is an abundant number, since it is smaller than the sum of its proper divisors (72258676628).

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

65680018420 is a wasteful number, since it uses less digits than its factorization.

65680018420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253731 (or 253729 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 65680018420 in words is "sixty-five billion, six hundred eighty million, eighteen thousand, four hundred twenty".