71020073861 has 4 divisors (see below), whose sum is σ = 77476444224. Its totient is φ = 64563703500.

The previous prime is 71020073857. The next prime is 71020073863. The reversal of 71020073861 is 16837002017.

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 71020073861 - 2² = 71020073857 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 (71020073863) 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, 3228185165 + ... + 3228185186.

It is an arithmetic number, because the mean of its divisors is an integer number (19369111056).

Almost surely, 2^71020073861 is an apocalyptic number.

It is an amenable number.

71020073861 is a deficient number, since it is larger than the sum of its proper divisors (6456370363).

71020073861 is a wasteful number, since it uses less digits than its factorization.

71020073861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6456370362.

The product of its (nonzero) digits is 14112, while the sum is 35.

Adding to 71020073861 its reverse (16837002017), we get a palindrome (87857075878).

The spelling of 71020073861 in words is "seventy-one billion, twenty million, seventy-three thousand, eight hundred sixty-one".