1191638187077 has 12 divisors (see below), whose sum is σ = 1300514065920. Its totient is φ = 1091312481168.

The previous prime is 1191638187071. The next prime is 1191638187083. The reversal of 1191638187077 is 7707818361911.

It is an interprime number because it is at equal distance from previous prime (1191638187071) and next prime (1191638187083).

It is not a de Polignac number, because 1191638187077 - 2³⁶ = 1122918710341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191638187071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27738827 + ... + 27781752.

It is an arithmetic number, because the mean of its divisors is an integer number (108376172160).

Almost surely, 2^{1191638187077} is an apocalyptic number.

It is an amenable number.

1191638187077 is a deficient number, since it is larger than the sum of its proper divisors (108875878843).

1191638187077 is a wasteful number, since it uses less digits than its factorization.

1191638187077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55520732 (or 55520719 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 59.

The spelling of 1191638187077 in words is "one trillion, one hundred ninety-one billion, six hundred thirty-eight million, one hundred eighty-seven thousand, seventy-seven".