68211564101 has 4 divisors (see below), whose sum is σ = 68213625612. Its totient is φ = 68209502592.

The previous prime is 68211564011. The next prime is 68211564131. The reversal of 68211564101 is 10146511286.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10146511286 = 2 ⋅5073255643.

It can be written as a sum of positive squares in 2 ways, for example, as 3525271876 + 64686292225 = 59374^2 + 254335^2 .

It is a cyclic number.

It is not a de Polignac number, because 68211564101 - 2¹⁸ = 68211301957 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 (68211564131) 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, 980300 + ... + 1047573.

It is an arithmetic number, because the mean of its divisors is an integer number (17053406403).

Almost surely, 2^68211564101 is an apocalyptic number.

It is an amenable number.

68211564101 is a deficient number, since it is larger than the sum of its proper divisors (2061511).

68211564101 is a wasteful number, since it uses less digits than its factorization.

68211564101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061510.

The product of its (nonzero) digits is 11520, while the sum is 35.

The spelling of 68211564101 in words is "sixty-eight billion, two hundred eleven million, five hundred sixty-four thousand, one hundred one".