78491367550 has 12 divisors (see below), whose sum is σ = 145993943736. Its totient is φ = 31396547000.

The previous prime is 78491367527. The next prime is 78491367551. The reversal of 78491367550 is 5576319487.

It is a junction number, because it is equal to n+sod(n) for n = 78491367491 and 78491367500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78491367551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 784913626 + ... + 784913725.

It is an arithmetic number, because the mean of its divisors is an integer number (12166161978).

Almost surely, 2^78491367550 is an apocalyptic number.

78491367550 is a deficient number, since it is larger than the sum of its proper divisors (67502576186).

78491367550 is a wasteful number, since it uses less digits than its factorization.

78491367550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1569827363 (or 1569827358 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 55.

The spelling of 78491367550 in words is "seventy-eight billion, four hundred ninety-one million, three hundred sixty-seven thousand, five hundred fifty".