78306317155 has 16 divisors (see below), whose sum is σ = 106967049984. Its totient is φ = 54473958880.

The previous prime is 78306317129. The next prime is 78306317191. The reversal of 78306317155 is 55171360387.

It is not a de Polignac number, because 78306317155 - 2⁵ = 78306317123 is a prime.

It is a super-2 number, since 2×78306317155² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30949849 + ... + 30952378.

It is an arithmetic number, because the mean of its divisors is an integer number (6685440624).

Almost surely, 2^78306317155 is an apocalyptic number.

78306317155 is a deficient number, since it is larger than the sum of its proper divisors (28660732829).

78306317155 is a wasteful number, since it uses less digits than its factorization.

78306317155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61902266.

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 78306317155 in words is "seventy-eight billion, three hundred six million, three hundred seventeen thousand, one hundred fifty-five".