78499557699264 has 252 divisors, whose sum is σ = 244172912295312. Its totient is φ = 24101302118400.

The previous prime is 78499557699253. The next prime is 78499557699287. The reversal of 78499557699264 is 46299675599487.

It is a happy number.

78499557699264 is a `hidden beast` number, since 7 + 8 + 4 + 9 + 9 + 5 + 576 + 9 + 9 + 26 + 4 = 666.

It is a super-2 number, since 2×78499557699264² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 44000949 + ... + 45750219.

It is an arithmetic number, because the mean of its divisors is an integer number (968940128156).

Almost surely, 2^{78499557699264} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78499557699264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122086456147656).

78499557699264 is an abundant number, since it is smaller than the sum of its proper divisors (165673354596048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78499557699264 is a wasteful number, since it uses less digits than its factorization.

78499557699264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749776 (or 1749750 counting only the distinct ones).

The product of its digits is 74071065600, while the sum is 90.

The spelling of 78499557699264 in words is "seventy-eight trillion, four hundred ninety-nine billion, five hundred fifty-seven million, six hundred ninety-nine thousand, two hundred sixty-four".