65290880821 has 4 divisors (see below), whose sum is σ = 65328255712. Its totient is φ = 65253505932.

The previous prime is 65290880803. The next prime is 65290880887. The reversal of 65290880821 is 12808809256.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65290880821 - 2¹⁵ = 65290848053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65290880621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18684825 + ... + 18688318.

It is an arithmetic number, because the mean of its divisors is an integer number (16332063928).

Almost surely, 2^65290880821 is an apocalyptic number.

It is an amenable number.

65290880821 is a deficient number, since it is larger than the sum of its proper divisors (37374891).

65290880821 is a wasteful number, since it uses less digits than its factorization.

65290880821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37374890.

The product of its (nonzero) digits is 552960, while the sum is 49.

The spelling of 65290880821 in words is "sixty-five billion, two hundred ninety million, eight hundred eighty thousand, eight hundred twenty-one".