78213215542385 has 32 divisors (see below), whose sum is σ = 117038705386752. Its totient is φ = 48746453172480.

The previous prime is 78213215542361. The next prime is 78213215542391. The reversal of 78213215542385 is 58324551231287.

It is not a de Polignac number, because 78213215542385 - 2³⁴ = 78196035673201 is a prime.

It is a super-2 number, since 2×78213215542385² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78213215542385.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18582902 + ... + 22399791.

It is an arithmetic number, because the mean of its divisors is an integer number (3657459543336).

Almost surely, 2^{78213215542385} is an apocalyptic number.

It is an amenable number.

78213215542385 is a deficient number, since it is larger than the sum of its proper divisors (38825489844367).

78213215542385 is a wasteful number, since it uses less digits than its factorization.

78213215542385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40987673.

The product of its digits is 16128000, while the sum is 56.

The spelling of 78213215542385 in words is "seventy-eight trillion, two hundred thirteen billion, two hundred fifteen million, five hundred forty-two thousand, three hundred eighty-five".