78213725677571 has 4 divisors (see below), whose sum is σ = 85324064375544. Its totient is φ = 71103386979600.

The previous prime is 78213725677553. The next prime is 78213725677621. The reversal of 78213725677571 is 17577652731287.

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 78213725677571 - 2¹⁴ = 78213725661187 is a prime.

It is a super-3 number, since 3×78213725677571³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78213725677471) 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, 3555169348970 + ... + 3555169348991.

It is an arithmetic number, because the mean of its divisors is an integer number (21331016093886).

Almost surely, 2^{78213725677571} is an apocalyptic number.

78213725677571 is a deficient number, since it is larger than the sum of its proper divisors (7110338697973).

78213725677571 is a wasteful number, since it uses less digits than its factorization.

78213725677571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7110338697972.

The product of its digits is 242020800, while the sum is 68.

The spelling of 78213725677571 in words is "seventy-eight trillion, two hundred thirteen billion, seven hundred twenty-five million, six hundred seventy-seven thousand, five hundred seventy-one".