78213700657811 has 2 divisors, whose sum is σ = 78213700657812. Its totient is φ = 78213700657810.

The previous prime is 78213700657801. The next prime is 78213700657853. The reversal of 78213700657811 is 11875600731287.

It is a weak prime.

It is an emirp because it is prime and its reverse (11875600731287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78213700657811 - 2¹⁸ = 78213700395667 is a prime.

It is a super-2 number, since 2×78213700657811² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78213700657801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39106850328905 + 39106850328906.

It is an arithmetic number, because the mean of its divisors is an integer number (39106850328906).

Almost surely, 2^{78213700657811} is an apocalyptic number.

78213700657811 is a deficient number, since it is larger than the sum of its proper divisors (1).

78213700657811 is an equidigital number, since it uses as much as digits as its factorization.

78213700657811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3951360, while the sum is 56.

The spelling of 78213700657811 in words is "seventy-eight trillion, two hundred thirteen billion, seven hundred million, six hundred fifty-seven thousand, eight hundred eleven".