78311161000 has 32 divisors (see below), whose sum is σ = 183248119080. Its totient is φ = 31324464000.

The previous prime is 78311160989. The next prime is 78311161087. The reversal of 78311161000 is 16111387.

It can be written as a sum of positive squares in 4 ways, for example, as 38831855364 + 39479305636 = 197058^2 + 198694^2 .

It is a super-2 number, since 2×78311161000² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78311161000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39154581 + ... + 39156580.

Almost surely, 2^78311161000 is an apocalyptic number.

It is an amenable number.

78311161000 is an abundant number, since it is smaller than the sum of its proper divisors (104936958080).

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

78311161000 is a wasteful number, since it uses less digits than its factorization.

78311161000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78311182 (or 78311168 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

Adding to 78311161000 its reverse (16111387), we get a palindrome (78327272387).

The spelling of 78311161000 in words is "seventy-eight billion, three hundred eleven million, one hundred sixty-one thousand".