78140175871844 has 6 divisors (see below), whose sum is σ = 136745307775734. Its totient is φ = 39070087935920.

The previous prime is 78140175871819. The next prime is 78140175871847. The reversal of 78140175871844 is 44817857104187.

It can be written as a sum of positive squares in only one way, i.e., 50032280222500 + 28107895649344 = 7073350^2 + 5301688^2 .

It is a super-2 number, since 2×78140175871844² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78140175871847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9767521983977 + ... + 9767521983984.

It is an arithmetic number, because the mean of its divisors is an integer number (22790884629289).

Almost surely, 2^{78140175871844} is an apocalyptic number.

It is an amenable number.

78140175871844 is a deficient number, since it is larger than the sum of its proper divisors (58605131903890).

78140175871844 is a wasteful number, since it uses less digits than its factorization.

78140175871844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19535043967965 (or 19535043967963 counting only the distinct ones).

The product of its (nonzero) digits is 56197120, while the sum is 65.

The spelling of 78140175871844 in words is "seventy-eight trillion, one hundred forty billion, one hundred seventy-five million, eight hundred seventy-one thousand, eight hundred forty-four".