78498399425 has 6 divisors (see below), whose sum is σ = 97338015318. Its totient is φ = 62798719520.

The previous prime is 78498399409. The next prime is 78498399457. The reversal of 78498399425 is 52499389487.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1356669889 + 77141729536 = 36833^2 + 277744^2 .

It is not a de Polignac number, because 78498399425 - 2⁴ = 78498399409 is a prime.

It is a super-3 number, since 3×78498399425³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1569967964 + ... + 1569968013.

It is an arithmetic number, because the mean of its divisors is an integer number (16223002553).

Almost surely, 2^78498399425 is an apocalyptic number.

It is an amenable number.

78498399425 is a deficient number, since it is larger than the sum of its proper divisors (18839615893).

78498399425 is a wasteful number, since it uses less digits than its factorization.

78498399425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3139935987 (or 3139935982 counting only the distinct ones).

The product of its digits is 156764160, while the sum is 68.

The spelling of 78498399425 in words is "seventy-eight billion, four hundred ninety-eight million, three hundred ninety-nine thousand, four hundred twenty-five".