81000078000063 has 32 divisors (see below), whose sum is σ = 111343442058240. Its totient is φ = 52339604526720.

The previous prime is 81000078000059. The next prime is 81000078000067. The reversal of 81000078000063 is 36000087000018.

It is an interprime number because it is at equal distance from previous prime (81000078000059) and next prime (81000078000067).

It is not a de Polignac number, because 81000078000063 - 2² = 81000078000059 is a prime.

It is a super-2 number, since 2×81000078000063² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81000077999988 and 81000078000033.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81000078000067) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 225939768 + ... + 226297986.

It is an arithmetic number, because the mean of its divisors is an integer number (3479482564320).

Almost surely, 2^{81000078000063} is an apocalyptic number.

81000078000063 is a deficient number, since it is larger than the sum of its proper divisors (30343364058177).

81000078000063 is a wasteful number, since it uses less digits than its factorization.

81000078000063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366047.

The product of its (nonzero) digits is 8064, while the sum is 33.

The spelling of 81000078000063 in words is "eighty-one trillion, seventy-eight million, sixty-three", and thus it is an aban number and an uban number.