78825648889819 has 8 divisors (see below), whose sum is σ = 84889419334272. Its totient is φ = 72761915444160.

The previous prime is 78825648889753. The next prime is 78825648889861. The reversal of 78825648889819 is 91898884652887.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78825648889819 - 2¹⁵ = 78825648857051 is a prime.

It is a super-2 number, since 2×78825648889819² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78825648883819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4743514 + ... + 13422079.

It is an arithmetic number, because the mean of its divisors is an integer number (10611177416784).

Almost surely, 2^{78825648889819} is an apocalyptic number.

78825648889819 is a deficient number, since it is larger than the sum of its proper divisors (6063770444453).

78825648889819 is a wasteful number, since it uses less digits than its factorization.

78825648889819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18499397.

The product of its digits is 35672555520, while the sum is 91.

The spelling of 78825648889819 in words is "seventy-eight trillion, eight hundred twenty-five billion, six hundred forty-eight million, eight hundred eighty-nine thousand, eight hundred nineteen".