78212117170 has 16 divisors (see below), whose sum is σ = 153580157568. Its totient is φ = 28440769840.

The previous prime is 78212117167. The next prime is 78212117173. The reversal of 78212117170 is 7171121287.

It is an interprime number because it is at equal distance from previous prime (78212117167) and next prime (78212117173).

It is a super-2 number, since 2×78212117170² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78212117173) 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, 355509514 + ... + 355509733.

It is an arithmetic number, because the mean of its divisors is an integer number (9598759848).

Almost surely, 2^78212117170 is an apocalyptic number.

78212117170 is a deficient number, since it is larger than the sum of its proper divisors (75368040398).

78212117170 is a wasteful number, since it uses less digits than its factorization.

78212117170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711019265.

The product of its (nonzero) digits is 10976, while the sum is 37.

The spelling of 78212117170 in words is "seventy-eight billion, two hundred twelve million, one hundred seventeen thousand, one hundred seventy".