81375788470 has 16 divisors (see below), whose sum is σ = 146480525568. Its totient is φ = 32549402880.

The previous prime is 81375788383. The next prime is 81375788531. The reversal of 81375788470 is 7488757318.

It is a super-2 number, since 2×81375788470² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350635 + ... + 534505.

It is an arithmetic number, because the mean of its divisors is an integer number (9155032848).

Almost surely, 2^81375788470 is an apocalyptic number.

81375788470 is a deficient number, since it is larger than the sum of its proper divisors (65104737098).

81375788470 is a wasteful number, since it uses less digits than its factorization.

81375788470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228135.

The product of its (nonzero) digits is 10536960, while the sum is 58.

The spelling of 81375788470 in words is "eighty-one billion, three hundred seventy-five million, seven hundred eighty-eight thousand, four hundred seventy".