81674570155 has 16 divisors (see below), whose sum is σ = 100669106304. Its totient is φ = 63566951040.

The previous prime is 81674570137. The next prime is 81674570183. The reversal of 81674570155 is 55107547618.

It is a happy number.

It is not a de Polignac number, because 81674570155 - 2⁹ = 81674569643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81674570099 and 81674570108.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2382990 + ... + 2417020.

It is an arithmetic number, because the mean of its divisors is an integer number (6291819144).

Almost surely, 2^81674570155 is an apocalyptic number.

81674570155 is a deficient number, since it is larger than the sum of its proper divisors (18994536149).

81674570155 is a wasteful number, since it uses less digits than its factorization.

81674570155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47046.

The product of its (nonzero) digits is 1176000, while the sum is 49.

The spelling of 81674570155 in words is "eighty-one billion, six hundred seventy-four million, five hundred seventy thousand, one hundred fifty-five".