91487766951 has 64 divisors (see below), whose sum is σ = 166522060800. Its totient is φ = 48473352288.

The previous prime is 91487766949. The next prime is 91487766983. The reversal of 91487766951 is 15966778419.

91487766951 is a `hidden beast` number, since 9 + 1 + 487 + 7 + 66 + 95 + 1 = 666.

It is not a de Polignac number, because 91487766951 - 2¹ = 91487766949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91487766911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 102255 + ... + 439808.

It is an arithmetic number, because the mean of its divisors is an integer number (2601907200).

Almost surely, 2^91487766951 is an apocalyptic number.

91487766951 is a deficient number, since it is larger than the sum of its proper divisors (75034293849).

91487766951 is a wasteful number, since it uses less digits than its factorization.

91487766951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542145 (or 542139 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 63.

The spelling of 91487766951 in words is "ninety-one billion, four hundred eighty-seven million, seven hundred sixty-six thousand, nine hundred fifty-one".