78475200742021 has 4 divisors (see below), whose sum is σ = 78475493936044. Its totient is φ = 78474907548000.

The previous prime is 78475200741989. The next prime is 78475200742033. The reversal of 78475200742021 is 12024700257487.

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

It can be written as a sum of positive squares in 2 ways, for example, as 43859757928900 + 34615442813121 = 6622670^2 + 5883489^2 .

It is a cyclic number.

It is not a de Polignac number, because 78475200742021 - 2⁵ = 78475200741989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78475200742091) 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, 146195160 + ... + 146730961.

It is an arithmetic number, because the mean of its divisors is an integer number (19618873484011).

Almost surely, 2^{78475200742021} is an apocalyptic number.

It is an amenable number.

78475200742021 is a deficient number, since it is larger than the sum of its proper divisors (293194023).

78475200742021 is a wasteful number, since it uses less digits than its factorization.

78475200742021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293194022.

The product of its (nonzero) digits is 1756160, while the sum is 49.

The spelling of 78475200742021 in words is "seventy-eight trillion, four hundred seventy-five billion, two hundred million, seven hundred forty-two thousand, twenty-one".