78797683961 has 2 divisors, whose sum is σ = 78797683962. Its totient is φ = 78797683960.

The previous prime is 78797683933. The next prime is 78797683967. The reversal of 78797683961 is 16938679787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40569613561 + 38228070400 = 201419^2 + 195520^2 .

It is an emirp because it is prime and its reverse (16938679787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78797683961 - 2⁶ = 78797683897 is a prime.

It is not a weakly prime, because it can be changed into another prime (78797683967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39398841980 + 39398841981.

It is an arithmetic number, because the mean of its divisors is an integer number (39398841981).

Almost surely, 2^78797683961 is an apocalyptic number.

It is an amenable number.

78797683961 is a deficient number, since it is larger than the sum of its proper divisors (1).

78797683961 is an equidigital number, since it uses as much as digits as its factorization.

78797683961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192036096, while the sum is 71.

The spelling of 78797683961 in words is "seventy-eight billion, seven hundred ninety-seven million, six hundred eighty-three thousand, nine hundred sixty-one".