65612021499 has 24 divisors (see below), whose sum is σ = 96509537280. Its totient is φ = 42941837232.

The previous prime is 65612021477. The next prime is 65612021507. The reversal of 65612021499 is 99412021656.

65612021499 is a `hidden beast` number, since 6 + 5 + 612 + 0 + 21 + 4 + 9 + 9 = 666.

It is not a de Polignac number, because 65612021499 - 2⁸ = 65612021243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65612021429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 311382 + ... + 477684.

It is an arithmetic number, because the mean of its divisors is an integer number (4021230720).

Almost surely, 2^65612021499 is an apocalyptic number.

65612021499 is a deficient number, since it is larger than the sum of its proper divisors (30897515781).

65612021499 is a wasteful number, since it uses less digits than its factorization.

65612021499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167111 (or 167108 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 65612021499 in words is "sixty-five billion, six hundred twelve million, twenty-one thousand, four hundred ninety-nine".