78180571738555 has 32 divisors (see below), whose sum is σ = 110255305644288. Its totient is φ = 52467192201600.

The previous prime is 78180571738501. The next prime is 78180571738583. The reversal of 78180571738555 is 55583717508187.

It is not a de Polignac number, because 78180571738555 - 2⁷ = 78180571738427 is a prime.

It is a super-2 number, since 2×78180571738555² (a number of 29 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (70) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16277529 + ... + 20526058.

It is an arithmetic number, because the mean of its divisors is an integer number (3445478301384).

Almost surely, 2^{78180571738555} is an apocalyptic number.

78180571738555 is a deficient number, since it is larger than the sum of its proper divisors (32074733905733).

78180571738555 is a wasteful number, since it uses less digits than its factorization.

78180571738555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36806587.

The product of its (nonzero) digits is 329280000, while the sum is 70.

The spelling of 78180571738555 in words is "seventy-eight trillion, one hundred eighty billion, five hundred seventy-one million, seven hundred thirty-eight thousand, five hundred fifty-five".