81640152134 has 8 divisors (see below), whose sum is σ = 122463295608. Its totient is φ = 40819053600.

The previous prime is 81640152119. The next prime is 81640152157. The reversal of 81640152134 is 43125104618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81640152134² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81640152094 and 81640152103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407192 + ... + 573659.

It is an arithmetic number, because the mean of its divisors is an integer number (15307911951).

Almost surely, 2^81640152134 is an apocalyptic number.

81640152134 is a deficient number, since it is larger than the sum of its proper divisors (40823143474).

81640152134 is a wasteful number, since it uses less digits than its factorization.

81640152134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022470.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 81640152134 in words is "eighty-one billion, six hundred forty million, one hundred fifty-two thousand, one hundred thirty-four".