81967401701 has 4 divisors (see below), whose sum is σ = 81969660000. Its totient is φ = 81965143404.

The previous prime is 81967401673. The next prime is 81967401749. The reversal of 81967401701 is 10710476918.

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 a de Polignac number, because none of the positive numbers 2^k-81967401701 is a prime.

It is a super-2 number, since 2×81967401701² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81967400701) 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, 1073801 + ... + 1147598.

It is an arithmetic number, because the mean of its divisors is an integer number (20492415000).

Almost surely, 2^81967401701 is an apocalyptic number.

It is an amenable number.

81967401701 is a deficient number, since it is larger than the sum of its proper divisors (2258299).

81967401701 is a wasteful number, since it uses less digits than its factorization.

81967401701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258298.

The product of its (nonzero) digits is 84672, while the sum is 44.

The spelling of 81967401701 in words is "eighty-one billion, nine hundred sixty-seven million, four hundred one thousand, seven hundred one".