78264189145 has 4 divisors (see below), whose sum is σ = 93917026980. Its totient is φ = 62611351312.

The previous prime is 78264189121. The next prime is 78264189173. The reversal of 78264189145 is 54198146287.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21792845376 + 56471343769 = 147624^2 + 237637^2 .

It is a cyclic number.

It is not a de Polignac number, because 78264189145 - 2¹¹ = 78264187097 is a prime.

It is a super-2 number, since 2×78264189145² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7826418910 + ... + 7826418919.

It is an arithmetic number, because the mean of its divisors is an integer number (23479256745).

Almost surely, 2^78264189145 is an apocalyptic number.

It is an amenable number.

78264189145 is a deficient number, since it is larger than the sum of its proper divisors (15652837835).

78264189145 is a wasteful number, since it uses less digits than its factorization.

78264189145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15652837834.

The product of its digits is 3870720, while the sum is 55.

The spelling of 78264189145 in words is "seventy-eight billion, two hundred sixty-four million, one hundred eighty-nine thousand, one hundred forty-five".