78155582117 has 8 divisors (see below), whose sum is σ = 80855090400. Its totient is φ = 75456373104.

The previous prime is 78155582083. The next prime is 78155582119. The reversal of 78155582117 is 71128555187.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78155582117 - 2¹⁶ = 78155516581 is a prime.

It is a super-2 number, since 2×78155582117² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78155582119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 543134 + ... + 671792.

It is an arithmetic number, because the mean of its divisors is an integer number (10106886300).

Almost surely, 2^78155582117 is an apocalyptic number.

It is an amenable number.

78155582117 is a deficient number, since it is larger than the sum of its proper divisors (2699508283).

78155582117 is a wasteful number, since it uses less digits than its factorization.

78155582117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149635.

The product of its digits is 784000, while the sum is 50.

The spelling of 78155582117 in words is "seventy-eight billion, one hundred fifty-five million, five hundred eighty-two thousand, one hundred seventeen".