78202500457 has 2 divisors, whose sum is σ = 78202500458. Its totient is φ = 78202500456.

The previous prime is 78202500449. The next prime is 78202500473. The reversal of 78202500457 is 75400520287.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77455899481 + 746600976 = 278309^2 + 27324^2 .

It is a cyclic number.

It is not a de Polignac number, because 78202500457 - 2³ = 78202500449 is a prime.

It is a super-2 number, since 2×78202500457² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78202500437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39101250228 + 39101250229.

It is an arithmetic number, because the mean of its divisors is an integer number (39101250229).

Almost surely, 2^78202500457 is an apocalyptic number.

It is an amenable number.

78202500457 is a deficient number, since it is larger than the sum of its proper divisors (1).

78202500457 is an equidigital number, since it uses as much as digits as its factorization.

78202500457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 156800, while the sum is 40.

The spelling of 78202500457 in words is "seventy-eight billion, two hundred two million, five hundred thousand, four hundred fifty-seven".