78664449583538 has 32 divisors (see below), whose sum is σ = 145229629077120. Its totient is φ = 31119369264000.

The previous prime is 78664449583501. The next prime is 78664449583541. The reversal of 78664449583538 is 83538594446687.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4632038 + ... + 13371038.

It is an arithmetic number, because the mean of its divisors is an integer number (4538425908660).

Almost surely, 2^{78664449583538} is an apocalyptic number.

78664449583538 is a deficient number, since it is larger than the sum of its proper divisors (66565179493582).

78664449583538 is a wasteful number, since it uses less digits than its factorization.

78664449583538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8788482.

The product of its digits is 16721510400, while the sum is 80.

The spelling of 78664449583538 in words is "seventy-eight trillion, six hundred sixty-four billion, four hundred forty-nine million, five hundred eighty-three thousand, five hundred thirty-eight".