78231515750427 has 16 divisors (see below), whose sum is σ = 112335399145760. Its totient is φ = 48141199971072.

The previous prime is 78231515750417. The next prime is 78231515750491. The reversal of 78231515750427 is 72405751513287.

It is not a de Polignac number, because 78231515750427 - 2¹² = 78231515746331 is a prime.

It is a super-2 number, since 2×78231515750427² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78231515750417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24987652 + ... + 27943617.

It is an arithmetic number, because the mean of its divisors is an integer number (7020962446610).

Almost surely, 2^{78231515750427} is an apocalyptic number.

78231515750427 is a deficient number, since it is larger than the sum of its proper divisors (34103883395333).

78231515750427 is a wasteful number, since it uses less digits than its factorization.

78231515750427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52969182.

The product of its (nonzero) digits is 16464000, while the sum is 57.

The spelling of 78231515750427 in words is "seventy-eight trillion, two hundred thirty-one billion, five hundred fifteen million, seven hundred fifty thousand, four hundred twenty-seven".