81677077618 has 8 divisors (see below), whose sum is σ = 123660622512. Its totient is φ = 40456870116.

The previous prime is 81677077543. The next prime is 81677077627.

81677077618 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×81677077618² (a number of 23 digits) contains 22 as substring.

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, 190834080 + ... + 190834507.

It is an arithmetic number, because the mean of its divisors is an integer number (15457577814).

Almost surely, 2^81677077618 is an apocalyptic number.

81677077618 is a deficient number, since it is larger than the sum of its proper divisors (41983544894).

81677077618 is a wasteful number, since it uses less digits than its factorization.

81677077618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381668696.

The product of its (nonzero) digits is 5531904, while the sum is 58.

The spelling of 81677077618 in words is "eighty-one billion, six hundred seventy-seven million, seventy-seven thousand, six hundred eighteen".