82640421873461 has 4 divisors (see below), whose sum is σ = 84562292149632. Its totient is φ = 80718551597292.

The previous prime is 82640421873439. The next prime is 82640421873467. The reversal of 82640421873461 is 16437812404628.

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 82640421873461 - 2⁶ = 82640421873397 is a prime.

It is a super-2 number, since 2×82640421873461² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82640421873397 and 82640421873406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82640421873467) 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, 960935138021 + ... + 960935138106.

It is an arithmetic number, because the mean of its divisors is an integer number (21140573037408).

Almost surely, 2^{82640421873461} is an apocalyptic number.

It is an amenable number.

82640421873461 is a deficient number, since it is larger than the sum of its proper divisors (1921870276171).

82640421873461 is a wasteful number, since it uses less digits than its factorization.

82640421873461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921870276170.

The product of its (nonzero) digits is 12386304, while the sum is 56.

The spelling of 82640421873461 in words is "eighty-two trillion, six hundred forty billion, four hundred twenty-one million, eight hundred seventy-three thousand, four hundred sixty-one".