78154045187 has 4 divisors (see below), whose sum is σ = 78154699536. Its totient is φ = 78153390840.

The previous prime is 78154045163. The next prime is 78154045199.

It is a happy number.

78154045187 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78154045187 is a prime.

It is a super-2 number, since 2×78154045187² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78154045087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91364 + ... + 405777.

It is an arithmetic number, because the mean of its divisors is an integer number (19538674884).

Almost surely, 2^78154045187 is an apocalyptic number.

78154045187 is a deficient number, since it is larger than the sum of its proper divisors (654349).

78154045187 is a wasteful number, since it uses less digits than its factorization.

78154045187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654348.

The product of its (nonzero) digits is 1254400, while the sum is 50.

The spelling of 78154045187 in words is "seventy-eight billion, one hundred fifty-four million, forty-five thousand, one hundred eighty-seven".