72896399861 has 2 divisors, whose sum is σ = 72896399862. Its totient is φ = 72896399860.

The previous prime is 72896399831. The next prime is 72896399887. The reversal of 72896399861 is 16899369827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48149963761 + 24746436100 = 219431^2 + 157310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72896399861 is a prime.

It is a super-2 number, since 2×72896399861² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72896399791 and 72896399800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72896399831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36448199930 + 36448199931.

It is an arithmetic number, because the mean of its divisors is an integer number (36448199931).

Almost surely, 2^72896399861 is an apocalyptic number.

It is an amenable number.

72896399861 is a deficient number, since it is larger than the sum of its proper divisors (1).

72896399861 is an equidigital number, since it uses as much as digits as its factorization.

72896399861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70543872, while the sum is 68.

The spelling of 72896399861 in words is "seventy-two billion, eight hundred ninety-six million, three hundred ninety-nine thousand, eight hundred sixty-one".