78520053737 has 2 divisors, whose sum is σ = 78520053738. Its totient is φ = 78520053736.

The previous prime is 78520053709. The next prime is 78520053743. The reversal of 78520053737 is 73735002587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43492685401 + 35027368336 = 208549^2 + 187156^2 .

It is a cyclic number.

It is not a de Polignac number, because 78520053737 - 2⁶ = 78520053673 is a prime.

It is a super-2 number, since 2×78520053737² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78520053691 and 78520053700.

It is not a weakly prime, because it can be changed into another prime (78520053707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39260026868 + 39260026869.

It is an arithmetic number, because the mean of its divisors is an integer number (39260026869).

Almost surely, 2^78520053737 is an apocalyptic number.

It is an amenable number.

78520053737 is a deficient number, since it is larger than the sum of its proper divisors (1).

78520053737 is an equidigital number, since it uses as much as digits as its factorization.

78520053737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1234800, while the sum is 47.

The spelling of 78520053737 in words is "seventy-eight billion, five hundred twenty million, fifty-three thousand, seven hundred thirty-seven".