81055951670 has 32 divisors (see below), whose sum is σ = 147571061760. Its totient is φ = 32051345920.

The previous prime is 81055951667. The next prime is 81055951721. The reversal of 81055951670 is 7615955018.

It is a super-2 number, since 2×81055951670² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7854434 + ... + 7864746.

It is an arithmetic number, because the mean of its divisors is an integer number (4611595680).

Almost surely, 2^81055951670 is an apocalyptic number.

81055951670 is a deficient number, since it is larger than the sum of its proper divisors (66515110090).

81055951670 is a wasteful number, since it uses less digits than its factorization.

81055951670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19240.

The product of its (nonzero) digits is 378000, while the sum is 47.

The spelling of 81055951670 in words is "eighty-one billion, fifty-five million, nine hundred fifty-one thousand, six hundred seventy".