78145553333638 has 16 divisors (see below), whose sum is σ = 135290180031264. Its totient is φ = 33159357849600.

The previous prime is 78145553333629. The next prime is 78145553333641. The reversal of 78145553333638 is 83633335554187.

It is a super-2 number, since 2×78145553333638² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78145553333638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27632796795 + ... + 27632799622.

It is an arithmetic number, because the mean of its divisors is an integer number (8455636251954).

Almost surely, 2^{78145553333638} is an apocalyptic number.

78145553333638 is a deficient number, since it is larger than the sum of its proper divisors (57144626697626).

78145553333638 is a wasteful number, since it uses less digits than its factorization.

78145553333638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55265596527.

The product of its digits is 326592000, while the sum is 64.

The spelling of 78145553333638 in words is "seventy-eight trillion, one hundred forty-five billion, five hundred fifty-three million, three hundred thirty-three thousand, six hundred thirty-eight".