91387929866 has 16 divisors (see below), whose sum is σ = 137329344000. Its totient is φ = 45611535888.

The previous prime is 91387929863. The next prime is 91387929869. The reversal of 91387929866 is 66892978319.

It is an interprime number because it is at equal distance from previous prime (91387929863) and next prime (91387929869).

It is a junction number, because it is equal to n+sod(n) for n = 91387929796 and 91387929805.

It is not an unprimeable number, because it can be changed into a prime (91387929863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3860735 + ... + 3884333.

It is an arithmetic number, because the mean of its divisors is an integer number (8583084000).

Almost surely, 2^91387929866 is an apocalyptic number.

91387929866 is a deficient number, since it is larger than the sum of its proper divisors (45941414134).

91387929866 is a wasteful number, since it uses less digits than its factorization.

91387929866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27013.

The product of its digits is 70543872, while the sum is 68.

The spelling of 91387929866 in words is "ninety-one billion, three hundred eighty-seven million, nine hundred twenty-nine thousand, eight hundred sixty-six".