81553335127 has 16 divisors (see below), whose sum is σ = 91075742208. Its totient is φ = 72383834880.

The previous prime is 81553335113. The next prime is 81553335131. The reversal of 81553335127 is 72153335518.

It is a cyclic number.

It is not a de Polignac number, because 81553335127 - 2²³ = 81544946519 is a prime.

It is a super-2 number, since 2×81553335127² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81553335427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1090983 + ... + 1163335.

It is an arithmetic number, because the mean of its divisors is an integer number (5692233888).

Almost surely, 2^81553335127 is an apocalyptic number.

81553335127 is a deficient number, since it is larger than the sum of its proper divisors (9522407081).

81553335127 is a wasteful number, since it uses less digits than its factorization.

81553335127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74790.

The product of its digits is 378000, while the sum is 43.

The spelling of 81553335127 in words is "eighty-one billion, five hundred fifty-three million, three hundred thirty-five thousand, one hundred twenty-seven".