78152312165357 has 4 divisors (see below), whose sum is σ = 78189333632256. Its totient is φ = 78115290698460.

The previous prime is 78152312165297. The next prime is 78152312165359. The reversal of 78152312165357 is 75356121325187.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78152312165357 - 2²⁶ = 78152245056493 is a prime.

It is a super-2 number, since 2×78152312165357² (a number of 29 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 (78152312165359) 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, 18510730283 + ... + 18510734504.

It is an arithmetic number, because the mean of its divisors is an integer number (19547333408064).

Almost surely, 2^{78152312165357} is an apocalyptic number.

It is an amenable number.

78152312165357 is a deficient number, since it is larger than the sum of its proper divisors (37021466899).

78152312165357 is a wasteful number, since it uses less digits than its factorization.

78152312165357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37021466898.

The product of its digits is 10584000, while the sum is 56.

The spelling of 78152312165357 in words is "seventy-eight trillion, one hundred fifty-two billion, three hundred twelve million, one hundred sixty-five thousand, three hundred fifty-seven".