86721057771 has 8 divisors (see below), whose sum is σ = 115961300544. Its totient is φ = 57647426760.

The previous prime is 86721057767. The next prime is 86721057799. The reversal of 86721057771 is 17775012768.

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

It is not a de Polignac number, because 86721057771 - 2² = 86721057767 is a prime.

It is a super-2 number, since 2×86721057771² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (86721057701) 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, 41651725 + ... + 41653806.

It is an arithmetic number, because the mean of its divisors is an integer number (14495162568).

Almost surely, 2^86721057771 is an apocalyptic number.

86721057771 is a deficient number, since it is larger than the sum of its proper divisors (29240242773).

86721057771 is a wasteful number, since it uses less digits than its factorization.

86721057771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83305881.

The product of its (nonzero) digits is 1152480, while the sum is 51.

The spelling of 86721057771 in words is "eighty-six billion, seven hundred twenty-one million, fifty-seven thousand, seven hundred seventy-one".