78107661071 has 8 divisors (see below), whose sum is σ = 85213540944. Its totient is φ = 71002645120.

The previous prime is 78107661061. The next prime is 78107661091. The reversal of 78107661071 is 17016670187.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-78107661071 is a prime.

It is a super-2 number, since 2×78107661071² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78107661001) 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, 19130 + ... + 395703.

It is an arithmetic number, because the mean of its divisors is an integer number (10651692618).

Almost surely, 2^78107661071 is an apocalyptic number.

78107661071 is a deficient number, since it is larger than the sum of its proper divisors (7105879873).

78107661071 is a wasteful number, since it uses less digits than its factorization.

78107661071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431961.

The product of its (nonzero) digits is 98784, while the sum is 44.

The spelling of 78107661071 in words is "seventy-eight billion, one hundred seven million, six hundred sixty-one thousand, seventy-one".