78328290641 has 2 divisors, whose sum is σ = 78328290642. Its totient is φ = 78328290640.

The previous prime is 78328290577. The next prime is 78328290739. The reversal of 78328290641 is 14609282387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74595080641 + 3733210000 = 273121^2 + 61100^2 .

It is a cyclic number.

It is not a de Polignac number, because 78328290641 - 2⁶ = 78328290577 is a prime.

It is a super-2 number, since 2×78328290641² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78328290641.

It is not a weakly prime, because it can be changed into another prime (78328292641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39164145320 + 39164145321.

It is an arithmetic number, because the mean of its divisors is an integer number (39164145321).

Almost surely, 2^78328290641 is an apocalyptic number.

It is an amenable number.

78328290641 is a deficient number, since it is larger than the sum of its proper divisors (1).

78328290641 is an equidigital number, since it uses as much as digits as its factorization.

78328290641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 78328290641 in words is "seventy-eight billion, three hundred twenty-eight million, two hundred ninety thousand, six hundred forty-one".