864621022501 has 4 divisors (see below), whose sum is σ = 864626345100. Its totient is φ = 864615699904.

The previous prime is 864621022453. The next prime is 864621022523. The reversal of 864621022501 is 105220126468.

It is a Cunningham number, because it is equal to 929850²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 417328920100 + 447292102401 = 646010^2 + 668799^2 .

It is a cyclic number.

It is not a de Polignac number, because 864621022501 - 2²¹ = 864618925349 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 (864621022591) 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, 2409706 + ... + 2745163.

It is an arithmetic number, because the mean of its divisors is an integer number (216156586275).

Almost surely, 2^864621022501 is an apocalyptic number.

It is an amenable number.

864621022501 is a deficient number, since it is larger than the sum of its proper divisors (5322599).

864621022501 is a wasteful number, since it uses less digits than its factorization.

864621022501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5322598.

The product of its (nonzero) digits is 46080, while the sum is 37.

Adding to 864621022501 its reverse (105220126468), we get a palindrome (969841148969).

The spelling of 864621022501 in words is "eight hundred sixty-four billion, six hundred twenty-one million, twenty-two thousand, five hundred one".