81077774071 has 8 divisors (see below), whose sum is σ = 92662884864. Its totient is φ = 69493306200.

The previous prime is 81077774039. The next prime is 81077774083. The reversal of 81077774071 is 17047777018.

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

It is a cyclic number.

It is not a de Polignac number, because 81077774071 - 2⁵ = 81077774039 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 (81077774021) 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, 149406 + ... + 429508.

It is an arithmetic number, because the mean of its divisors is an integer number (11582860608).

Almost surely, 2^81077774071 is an apocalyptic number.

81077774071 is a deficient number, since it is larger than the sum of its proper divisors (11585110793).

81077774071 is a wasteful number, since it uses less digits than its factorization.

81077774071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321461.

The product of its (nonzero) digits is 537824, while the sum is 49.

The spelling of 81077774071 in words is "eighty-one billion, seventy-seven million, seven hundred seventy-four thousand, seventy-one".