78171400971 has 16 divisors (see below), whose sum is σ = 115814924800. Its totient is φ = 52111818504.

The previous prime is 78171400969. The next prime is 78171400981. The reversal of 78171400971 is 17900417187.

78171400971 is a `hidden beast` number, since 7 + 8 + 171 + 400 + 9 + 71 = 666.

It is not a de Polignac number, because 78171400971 - 2¹ = 78171400969 is a prime.

It is a super-2 number, since 2×78171400971² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78171400981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 658170 + ... + 767808.

It is an arithmetic number, because the mean of its divisors is an integer number (7238432800).

Almost surely, 2^78171400971 is an apocalyptic number.

78171400971 is a deficient number, since it is larger than the sum of its proper divisors (37643523829).

78171400971 is a wasteful number, since it uses less digits than its factorization.

78171400971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136055 (or 136049 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 45.

The spelling of 78171400971 in words is "seventy-eight billion, one hundred seventy-one million, four hundred thousand, nine hundred seventy-one".