71820079149061 has 2 divisors, whose sum is σ = 71820079149062. Its totient is φ = 71820079149060.

The previous prime is 71820079148969. The next prime is 71820079149067. The reversal of 71820079149061 is 16094197002817.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48440291528836 + 23379787620225 = 6959906^2 + 4835265^2 .

It is an emirp because it is prime and its reverse (16094197002817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71820079149061 - 2³¹ = 71817931665413 is a prime.

It is a super-2 number, since 2×71820079149061² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71820079148993 and 71820079149011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71820079149067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35910039574530 + 35910039574531.

It is an arithmetic number, because the mean of its divisors is an integer number (35910039574531).

Almost surely, 2^{71820079149061} is an apocalyptic number.

It is an amenable number.

71820079149061 is a deficient number, since it is larger than the sum of its proper divisors (1).

71820079149061 is an equidigital number, since it uses as much as digits as its factorization.

71820079149061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 71820079149061 in words is "seventy-one trillion, eight hundred twenty billion, seventy-nine million, one hundred forty-nine thousand, sixty-one".