82861970061521 has 4 divisors (see below), whose sum is σ = 94699394356032. Its totient is φ = 71024545767012.

The previous prime is 82861970061461. The next prime is 82861970061539. The reversal of 82861970061521 is 12516007916828.

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 82861970061521 - 2¹⁴ = 82861970045137 is a prime.

It is a super-2 number, since 2×82861970061521² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82861970061581) 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, 5918712147245 + ... + 5918712147258.

It is an arithmetic number, because the mean of its divisors is an integer number (23674848589008).

Almost surely, 2^{82861970061521} is an apocalyptic number.

It is an amenable number.

82861970061521 is a deficient number, since it is larger than the sum of its proper divisors (11837424294511).

82861970061521 is a wasteful number, since it uses less digits than its factorization.

82861970061521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11837424294510.

The product of its (nonzero) digits is 2903040, while the sum is 56.

The spelling of 82861970061521 in words is "eighty-two trillion, eight hundred sixty-one billion, nine hundred seventy million, sixty-one thousand, five hundred twenty-one".