78298249129 has 2 divisors, whose sum is σ = 78298249130. Its totient is φ = 78298249128.

The previous prime is 78298249109. The next prime is 78298249153. The reversal of 78298249129 is 92194289287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68056809129 + 10241440000 = 260877^2 + 101200^2 .

It is a cyclic number.

It is not a de Polignac number, because 78298249129 - 2¹⁷ = 78298118057 is a prime.

It is a super-2 number, since 2×78298249129² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78298249109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39149124564 + 39149124565.

It is an arithmetic number, because the mean of its divisors is an integer number (39149124565).

Almost surely, 2^78298249129 is an apocalyptic number.

It is an amenable number.

78298249129 is a deficient number, since it is larger than the sum of its proper divisors (1).

78298249129 is an equidigital number, since it uses as much as digits as its factorization.

78298249129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 61.

The spelling of 78298249129 in words is "seventy-eight billion, two hundred ninety-eight million, two hundred forty-nine thousand, one hundred twenty-nine".