11990740491 has 24 divisors (see below), whose sum is σ = 17428801104. Its totient is φ = 7943691840.

The previous prime is 11990740409. The next prime is 11990740513. The reversal of 11990740491 is 19404709911.

11990740491 is a `hidden beast` number, since 1 + 1 + 9 + 90 + 74 + 0 + 491 = 666.

It is not a de Polignac number, because 11990740491 - 2²⁶ = 11923631627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11990740691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1664800 + ... + 1671986.

It is an arithmetic number, because the mean of its divisors is an integer number (726200046).

Almost surely, 2^11990740491 is an apocalyptic number.

11990740491 is a deficient number, since it is larger than the sum of its proper divisors (5438060613).

11990740491 is a wasteful number, since it uses less digits than its factorization.

11990740491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8331 (or 8328 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The spelling of 11990740491 in words is "eleven billion, nine hundred ninety million, seven hundred forty thousand, four hundred ninety-one".