81555563046 has 16 divisors (see below), whose sum is σ = 163145645424. Its totient is φ = 27179434464.

The previous prime is 81555563041. The next prime is 81555563051. The reversal of 81555563046 is 64036555518.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81555563041) and next prime (81555563051).

It is a junction number, because it is equal to n+sod(n) for n = 81555562986 and 81555563004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81555563041) 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, 1407541 + ... + 1464336.

It is an arithmetic number, because the mean of its divisors is an integer number (10196602839).

Almost surely, 2^81555563046 is an apocalyptic number.

81555563046 is an abundant number, since it is smaller than the sum of its proper divisors (81590082378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81555563046 is a wasteful number, since it uses less digits than its factorization.

81555563046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2876615.

The product of its (nonzero) digits is 2160000, while the sum is 48.

The spelling of 81555563046 in words is "eighty-one billion, five hundred fifty-five million, five hundred sixty-three thousand, forty-six".