11670447891 has 16 divisors (see below), whose sum is σ = 16164881408. Its totient is φ = 7481354400.

The previous prime is 11670447869. The next prime is 11670447973. The reversal of 11670447891 is 19874407611.

It is not a de Polignac number, because 11670447891 - 2¹³ = 11670439699 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11670447891.

It is not an unprimeable number, because it can be changed into a prime (11670447821) 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, 385045 + ... + 414246.

It is an arithmetic number, because the mean of its divisors is an integer number (1010305088).

Almost surely, 2^11670447891 is an apocalyptic number.

11670447891 is a deficient number, since it is larger than the sum of its proper divisors (4494433517).

11670447891 is a wasteful number, since it uses less digits than its factorization.

11670447891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799482.

The product of its (nonzero) digits is 338688, while the sum is 48.

The spelling of 11670447891 in words is "eleven billion, six hundred seventy million, four hundred forty-seven thousand, eight hundred ninety-one".