1191147864638 has 16 divisors (see below), whose sum is σ = 1803507928704. Its totient is φ = 589979097240.

The previous prime is 1191147864637. The next prime is 1191147864703. The reversal of 1191147864638 is 8364687411911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191147864637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4667381 + ... + 4915967.

It is an arithmetic number, because the mean of its divisors is an integer number (112719245544).

Almost surely, 2^{1191147864638} is an apocalyptic number.

1191147864638 is a deficient number, since it is larger than the sum of its proper divisors (612360064066).

1191147864638 is a wasteful number, since it uses less digits than its factorization.

1191147864638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271087.

The product of its digits is 6967296, while the sum is 59.

The spelling of 1191147864638 in words is "one trillion, one hundred ninety-one billion, one hundred forty-seven million, eight hundred sixty-four thousand, six hundred thirty-eight".