646211202606121 has 8 divisors (see below), whose sum is σ = 684358289562024. Its totient is φ = 608079078236160.

The previous prime is 646211202606083. The next prime is 646211202606131. The reversal of 646211202606121 is 121606202112646.

It can be written as a sum of positive squares in 4 ways, for example, as 40596509228521 + 605614693377600 = 6371539^2 + 24609240^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646211202606121 - 2¹¹ = 646211202604073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646211202606131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3740557560 + ... + 3740730313.

It is an arithmetic number, because the mean of its divisors is an integer number (85544786195253).

Almost surely, 2^{646211202606121} is an apocalyptic number.

It is an amenable number.

646211202606121 is a deficient number, since it is larger than the sum of its proper divisors (38147086955903).

646211202606121 is a wasteful number, since it uses less digits than its factorization.

646211202606121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7481292971.

The product of its (nonzero) digits is 82944, while the sum is 40.

Adding to 646211202606121 its reverse (121606202112646), we get a palindrome (767817404718767).

The spelling of 646211202606121 in words is "six hundred forty-six trillion, two hundred eleven billion, two hundred two million, six hundred six thousand, one hundred twenty-one".