65209235940 has 72 divisors (see below), whose sum is σ = 204182055168. Its totient is φ = 16828188480.

The previous prime is 65209235911. The next prime is 65209235957. The reversal of 65209235940 is 4953290256.

65209235940 is a `hidden beast` number, since 6 + 52 + 0 + 9 + 2 + 3 + 594 + 0 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5837542 + ... + 5848701.

Almost surely, 2^65209235940 is an apocalyptic number.

65209235940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65209235940 is an abundant number, since it is smaller than the sum of its proper divisors (138972819228).

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

65209235940 is a wasteful number, since it uses less digits than its factorization.

65209235940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11686289 (or 11686284 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The spelling of 65209235940 in words is "sixty-five billion, two hundred nine million, two hundred thirty-five thousand, nine hundred forty".