71197964861 has 4 divisors (see below), whose sum is σ = 71200517724. Its totient is φ = 71195412000.

The previous prime is 71197964857. The next prime is 71197964863. The reversal of 71197964861 is 16846979117.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26505468025 + 44692496836 = 162805^2 + 211406^2 .

It is a cyclic number.

It is not a de Polignac number, because 71197964861 - 2² = 71197964857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71197964861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71197964863) 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, 1234130 + ... + 1290531.

It is an arithmetic number, because the mean of its divisors is an integer number (17800129431).

Almost surely, 2^71197964861 is an apocalyptic number.

It is an amenable number.

71197964861 is a deficient number, since it is larger than the sum of its proper divisors (2552863).

71197964861 is a wasteful number, since it uses less digits than its factorization.

71197964861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2552862.

The product of its digits is 4572288, while the sum is 59.

The spelling of 71197964861 in words is "seventy-one billion, one hundred ninety-seven million, nine hundred sixty-four thousand, eight hundred sixty-one".