78213704688537 has 16 divisors (see below), whose sum is σ = 116840128873152. Its totient is φ = 46121103501120.

The previous prime is 78213704688491. The next prime is 78213704688541. The reversal of 78213704688537 is 73588640731287.

It is not a de Polignac number, because 78213704688537 - 2¹¹ = 78213704686489 is a prime.

It is a super-3 number, since 3×78213704688537³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (78213704688037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32028542878 + ... + 32028545319.

It is an arithmetic number, because the mean of its divisors is an integer number (7302508054572).

Almost surely, 2^{78213704688537} is an apocalyptic number.

It is an amenable number.

78213704688537 is a deficient number, since it is larger than the sum of its proper divisors (38626424184615).

78213704688537 is a wasteful number, since it uses less digits than its factorization.

78213704688537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64057088248.

The product of its (nonzero) digits is 379330560, while the sum is 69.

The spelling of 78213704688537 in words is "seventy-eight trillion, two hundred thirteen billion, seven hundred four million, six hundred eighty-eight thousand, five hundred thirty-seven".