78381705151 has 4 divisors (see below), whose sum is σ = 81084522600. Its totient is φ = 75678887704.

The previous prime is 78381705113. The next prime is 78381705169. The reversal of 78381705151 is 15150718387.

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

It is a cyclic number.

It is not a de Polignac number, because 78381705151 - 2¹⁷ = 78381574079 is a prime.

It is a super-2 number, since 2×78381705151² (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 (78381700151) 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, 1351408681 + ... + 1351408738.

It is an arithmetic number, because the mean of its divisors is an integer number (20271130650).

Almost surely, 2^78381705151 is an apocalyptic number.

78381705151 is a deficient number, since it is larger than the sum of its proper divisors (2702817449).

78381705151 is a wasteful number, since it uses less digits than its factorization.

78381705151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2702817448.

The product of its (nonzero) digits is 235200, while the sum is 46.

The spelling of 78381705151 in words is "seventy-eight billion, three hundred eighty-one million, seven hundred five thousand, one hundred fifty-one".