78174418642 has 4 divisors (see below), whose sum is σ = 117261627966. Its totient is φ = 39087209320.

The previous prime is 78174418639. The next prime is 78174418649. The reversal of 78174418642 is 24681447187.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 55833436681 + 22340981961 = 236291^2 + 149469^2 .

It is a super-2 number, since 2×78174418642² (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 78174418642.

It is not an unprimeable number, because it can be changed into a prime (78174418649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19543604659 + ... + 19543604662.

Almost surely, 2^78174418642 is an apocalyptic number.

78174418642 is a deficient number, since it is larger than the sum of its proper divisors (39087209324).

78174418642 is a wasteful number, since it uses less digits than its factorization.

78174418642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39087209323.

The product of its digits is 2408448, while the sum is 52.

The spelling of 78174418642 in words is "seventy-eight billion, one hundred seventy-four million, four hundred eighteen thousand, six hundred forty-two".