78637754568121 has 8 divisors (see below), whose sum is σ = 95158291242240. Its totient is φ = 63438860827968.

The previous prime is 78637754568119. The next prime is 78637754568157. The reversal of 78637754568121 is 12186545773687.

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 78637754568121 - 2¹ = 78637754568119 is a prime.

It is a super-3 number, since 3×78637754568121³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78637754568161) 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, 330410733361 + ... + 330410733598.

It is an arithmetic number, because the mean of its divisors is an integer number (11894786405280).

Almost surely, 2^{78637754568121} is an apocalyptic number.

It is an amenable number.

78637754568121 is a deficient number, since it is larger than the sum of its proper divisors (16520536674119).

78637754568121 is a wasteful number, since it uses less digits than its factorization.

78637754568121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660821466983.

The product of its digits is 474163200, while the sum is 70.

The spelling of 78637754568121 in words is "seventy-eight trillion, six hundred thirty-seven billion, seven hundred fifty-four million, five hundred sixty-eight thousand, one hundred twenty-one".