78257206021047 has 4 divisors (see below), whose sum is σ = 104342941361400. Its totient is φ = 52171470680696.

The previous prime is 78257206021031. The next prime is 78257206021063. The reversal of 78257206021047 is 74012060275287.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (78257206021031) and next prime (78257206021063).

It is a cyclic number.

It is not a de Polignac number, because 78257206021047 - 2⁴ = 78257206021031 is a prime.

It is a super-2 number, since 2×78257206021047² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78257206021097) 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, 13042867670172 + ... + 13042867670177.

It is an arithmetic number, because the mean of its divisors is an integer number (26085735340350).

Almost surely, 2^{78257206021047} is an apocalyptic number.

78257206021047 is a deficient number, since it is larger than the sum of its proper divisors (26085735340353).

78257206021047 is a wasteful number, since it uses less digits than its factorization.

78257206021047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26085735340352.

The product of its (nonzero) digits is 2634240, while the sum is 51.

The spelling of 78257206021047 in words is "seventy-eight trillion, two hundred fifty-seven billion, two hundred six million, twenty-one thousand, forty-seven".