78353940073 has 2 divisors, whose sum is σ = 78353940074. Its totient is φ = 78353940072.

The previous prime is 78353940059. The next prime is 78353940089. The reversal of 78353940073 is 37004935387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47198866009 + 31155074064 = 217253^2 + 176508^2 .

It is a cyclic number.

It is not a de Polignac number, because 78353940073 - 2⁹ = 78353939561 is a prime.

It is a super-2 number, since 2×78353940073² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78353939999 and 78353940026.

It is not a weakly prime, because it can be changed into another prime (78353940013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39176970036 + 39176970037.

It is an arithmetic number, because the mean of its divisors is an integer number (39176970037).

Almost surely, 2^78353940073 is an apocalyptic number.

It is an amenable number.

78353940073 is a deficient number, since it is larger than the sum of its proper divisors (1).

78353940073 is an equidigital number, since it uses as much as digits as its factorization.

78353940073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 49.

The spelling of 78353940073 in words is "seventy-eight billion, three hundred fifty-three million, nine hundred forty thousand, seventy-three".