91374378721390 has 16 divisors (see below), whose sum is σ = 164559057228720. Its totient is φ = 36530823592960.

The previous prime is 91374378721319. The next prime is 91374378721411. The reversal of 91374378721390 is 9312787347319.

It is a super-3 number, since 3×91374378721390³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2365966675 + ... + 2366005294.

It is an arithmetic number, because the mean of its divisors is an integer number (10284941076795).

Almost surely, 2^{91374378721390} is an apocalyptic number.

91374378721390 is a deficient number, since it is larger than the sum of its proper divisors (73184678507330).

91374378721390 is a wasteful number, since it uses less digits than its factorization.

91374378721390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4731973907.

The product of its (nonzero) digits is 48009024, while the sum is 64.

The spelling of 91374378721390 in words is "ninety-one trillion, three hundred seventy-four billion, three hundred seventy-eight million, seven hundred twenty-one thousand, three hundred ninety".