91668519015 has 16 divisors (see below), whose sum is σ = 146694872448. Its totient is φ = 48881462816.

The previous prime is 91668519013. The next prime is 91668519023. The reversal of 91668519015 is 51091586619.

It is a cyclic number.

It is not a de Polignac number, because 91668519015 - 2¹ = 91668519013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91668519011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435309 + ... + 610598.

It is an arithmetic number, because the mean of its divisors is an integer number (9168429528).

Almost surely, 2^91668519015 is an apocalyptic number.

91668519015 is a deficient number, since it is larger than the sum of its proper divisors (55026353433).

91668519015 is a wasteful number, since it uses less digits than its factorization.

91668519015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051758.

The product of its (nonzero) digits is 583200, while the sum is 51.

The spelling of 91668519015 in words is "ninety-one billion, six hundred sixty-eight million, five hundred nineteen thousand, fifteen".