78161620524101 has 4 divisors (see below), whose sum is σ = 78192284167500. Its totient is φ = 78130956880704.

The previous prime is 78161620524077. The next prime is 78161620524131. The reversal of 78161620524101 is 10142502616187.

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 42482681479876 + 35678939044225 = 6517874^2 + 5973185^2 .

It is a cyclic number.

It is not a de Polignac number, because 78161620524101 - 2¹⁴ = 78161620507717 is a prime.

It is a super-2 number, since 2×78161620524101² (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 (78161620524131) 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, 15331817876 + ... + 15331822973.

It is an arithmetic number, because the mean of its divisors is an integer number (19548071041875).

Almost surely, 2^{78161620524101} is an apocalyptic number.

It is an amenable number.

78161620524101 is a deficient number, since it is larger than the sum of its proper divisors (30663643399).

78161620524101 is a wasteful number, since it uses less digits than its factorization.

78161620524101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30663643398.

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 78161620524101 in words is "seventy-eight trillion, one hundred sixty-one billion, six hundred twenty million, five hundred twenty-four thousand, one hundred one".