78800241378731 has 2 divisors, whose sum is σ = 78800241378732. Its totient is φ = 78800241378730.

The previous prime is 78800241378689. The next prime is 78800241378811. The reversal of 78800241378731 is 13787314200887.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78800241378731 - 2¹⁰ = 78800241377707 is a prime.

It is a super-2 number, since 2×78800241378731² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (78800241378931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39400120689365 + 39400120689366.

It is an arithmetic number, because the mean of its divisors is an integer number (39400120689366).

Almost surely, 2^{78800241378731} is an apocalyptic number.

78800241378731 is a deficient number, since it is larger than the sum of its proper divisors (1).

78800241378731 is an equidigital number, since it uses as much as digits as its factorization.

78800241378731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12644352, while the sum is 59.

The spelling of 78800241378731 in words is "seventy-eight trillion, eight hundred billion, two hundred forty-one million, three hundred seventy-eight thousand, seven hundred thirty-one".