71801164477816 has 8 divisors (see below), whose sum is σ = 134627183395920. Its totient is φ = 35900582238904.

The previous prime is 71801164477793. The next prime is 71801164477849. The reversal of 71801164477816 is 61877446110817.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×71801164477816² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4487572779856 + ... + 4487572779871.

It is an arithmetic number, because the mean of its divisors is an integer number (16828397924490).

Almost surely, 2^{71801164477816} is an apocalyptic number.

It is an amenable number.

71801164477816 is a deficient number, since it is larger than the sum of its proper divisors (62826018918104).

71801164477816 is a wasteful number, since it uses less digits than its factorization.

71801164477816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8975145559733 (or 8975145559729 counting only the distinct ones).

The product of its (nonzero) digits is 12644352, while the sum is 61.

The spelling of 71801164477816 in words is "seventy-one trillion, eight hundred one billion, one hundred sixty-four million, four hundred seventy-seven thousand, eight hundred sixteen".