78251306501 has 2 divisors, whose sum is σ = 78251306502. Its totient is φ = 78251306500.

The previous prime is 78251306479. The next prime is 78251306503. The reversal of 78251306501 is 10560315287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66795885601 + 11455420900 = 258449^2 + 107030^2 .

It is a cyclic number.

It is not a de Polignac number, because 78251306501 - 2¹⁸ = 78251044357 is a prime.

It is a super-2 number, since 2×78251306501² (a number of 23 digits) contains 22 as substring.

Together with 78251306503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78251306503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39125653250 + 39125653251.

It is an arithmetic number, because the mean of its divisors is an integer number (39125653251).

Almost surely, 2^78251306501 is an apocalyptic number.

It is an amenable number.

78251306501 is a deficient number, since it is larger than the sum of its proper divisors (1).

78251306501 is an equidigital number, since it uses as much as digits as its factorization.

78251306501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 78251306501 in words is "seventy-eight billion, two hundred fifty-one million, three hundred six thousand, five hundred one".