11691277890 has 32 divisors (see below), whose sum is σ = 29279028096. Its totient is φ = 2982122880.

The previous prime is 11691277883. The next prime is 11691277891. The reversal of 11691277890 is 9877219611.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (11691277891) 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, 8471251 + ... + 8472630.

It is an arithmetic number, because the mean of its divisors is an integer number (914969628).

Almost surely, 2^11691277890 is an apocalyptic number.

11691277890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11691277890 is an abundant number, since it is smaller than the sum of its proper divisors (17587750206).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11691277890 is a wasteful number, since it uses less digits than its factorization.

11691277890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16943914.

The product of its (nonzero) digits is 381024, while the sum is 51.

The spelling of 11691277890 in words is "eleven billion, six hundred ninety-one million, two hundred seventy-seven thousand, eight hundred ninety".