78344527617 has 16 divisors (see below), whose sum is σ = 118896845760. Its totient is φ = 50955789600.

The previous prime is 78344527601. The next prime is 78344527633. The reversal of 78344527617 is 71672544387.

78344527617 is a `hidden beast` number, since 78 + 3 + 44 + 527 + 6 + 1 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (78344527601) and next prime (78344527633).

It is not a de Polignac number, because 78344527617 - 2⁴ = 78344527601 is a prime.

It is a super-2 number, since 2×78344527617² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78344527517) 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, 35384859 + ... + 35387072.

It is an arithmetic number, because the mean of its divisors is an integer number (7431052860).

Almost surely, 2^78344527617 is an apocalyptic number.

It is an amenable number.

78344527617 is a deficient number, since it is larger than the sum of its proper divisors (40552318143).

78344527617 is a wasteful number, since it uses less digits than its factorization.

78344527617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70771981 (or 70771975 counting only the distinct ones).

The product of its digits is 7902720, while the sum is 54.

The spelling of 78344527617 in words is "seventy-eight billion, three hundred forty-four million, five hundred twenty-seven thousand, six hundred seventeen".