78538538687552 has 28 divisors (see below), whose sum is σ = 156641029041420. Its totient is φ = 39069932944896.

The previous prime is 78538538687503. The next prime is 78538538687563. The reversal of 78538538687552 is 25578683583587.

It can be written as a sum of positive squares in 2 ways, for example, as 56906142355456 + 21632396332096 = 7543616^2 + 4651064^2 .

It is a super-3 number, since 3×78538538687552³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3114618527 + ... + 3114643742.

It is an arithmetic number, because the mean of its divisors is an integer number (5594322465765).

Almost surely, 2^{78538538687552} is an apocalyptic number.

It is an amenable number.

78538538687552 is a deficient number, since it is larger than the sum of its proper divisors (78102490353868).

78538538687552 is a wasteful number, since it uses less digits than its factorization.

78538538687552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6229262478 (or 6229262468 counting only the distinct ones).

The product of its digits is 13547520000, while the sum is 80.

The spelling of 78538538687552 in words is "seventy-eight trillion, five hundred thirty-eight billion, five hundred thirty-eight million, six hundred eighty-seven thousand, five hundred fifty-two".