91921857370 has 16 divisors (see below), whose sum is σ = 189096392448. Its totient is φ = 31516065360.

The previous prime is 91921857347. The next prime is 91921857371. The reversal of 91921857370 is 7375812919.

It is not an unprimeable number, because it can be changed into a prime (91921857371) 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, 656584626 + ... + 656584765.

It is an arithmetic number, because the mean of its divisors is an integer number (11818524528).

Almost surely, 2^91921857370 is an apocalyptic number.

91921857370 is an abundant number, since it is smaller than the sum of its proper divisors (97174535078).

91921857370 is a wasteful number, since it uses less digits than its factorization.

91921857370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313169405.

The product of its (nonzero) digits is 952560, while the sum is 52.

The spelling of 91921857370 in words is "ninety-one billion, nine hundred twenty-one million, eight hundred fifty-seven thousand, three hundred seventy".