78423335746421 has 8 divisors (see below), whose sum is σ = 78605584050840. Its totient is φ = 78241092659712.

The previous prime is 78423335746409. The next prime is 78423335746493. The reversal of 78423335746421 is 12464753332487.

It can be written as a sum of positive squares in 4 ways, for example, as 5909833930225 + 72513501816196 = 2431015^2 + 8515486^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78423335746421 - 2¹⁴ = 78423335730037 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 (78423335716421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29642921 + ... + 32179953.

It is an arithmetic number, because the mean of its divisors is an integer number (9825698006355).

Almost surely, 2^{78423335746421} is an apocalyptic number.

It is an amenable number.

78423335746421 is a deficient number, since it is larger than the sum of its proper divisors (182248304419).

78423335746421 is a wasteful number, since it uses less digits than its factorization.

78423335746421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608855.

The product of its digits is 81285120, while the sum is 59.

The spelling of 78423335746421 in words is "seventy-eight trillion, four hundred twenty-three billion, three hundred thirty-five million, seven hundred forty-six thousand, four hundred twenty-one".