78157171340 has 24 divisors (see below), whose sum is σ = 164664698352. Its totient is φ = 31161032640.

The previous prime is 78157171331. The next prime is 78157171349. The reversal of 78157171340 is 4317175187.

It is an interprime number because it is at equal distance from previous prime (78157171331) and next prime (78157171349).

It is a super-2 number, since 2×78157171340² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78157171291 and 78157171300.

It is not an unprimeable number, because it can be changed into a prime (78157171349) 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, 6358451 + ... + 6370730.

It is an arithmetic number, because the mean of its divisors is an integer number (6861029098).

Almost surely, 2^78157171340 is an apocalyptic number.

It is an amenable number.

78157171340 is an abundant number, since it is smaller than the sum of its proper divisors (86507527012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78157171340 is a wasteful number, since it uses less digits than its factorization.

78157171340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12729497 (or 12729495 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 44.

The spelling of 78157171340 in words is "seventy-eight billion, one hundred fifty-seven million, one hundred seventy-one thousand, three hundred forty".