11915011971197 has 4 divisors (see below), whose sum is σ = 12024324007740. Its totient is φ = 11805699934656.

The previous prime is 11915011971119. The next prime is 11915011971229. The reversal of 11915011971197 is 79117911051911.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3721557989956 + 8193453981241 = 1929134^2 + 2862421^2 .

It is a cyclic number.

It is not a de Polignac number, because 11915011971197 - 2¹⁶ = 11915011905661 is a prime.

It is a super-2 number, since 2×11915011971197² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11915011973197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54656018108 + ... + 54656018325.

It is an arithmetic number, because the mean of its divisors is an integer number (3006081001935).

Almost surely, 2^{11915011971197} is an apocalyptic number.

It is an amenable number.

11915011971197 is a deficient number, since it is larger than the sum of its proper divisors (109312036543).

11915011971197 is a wasteful number, since it uses less digits than its factorization.

11915011971197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109312036542.

The product of its (nonzero) digits is 178605, while the sum is 53.

The spelling of 11915011971197 in words is "eleven trillion, nine hundred fifteen billion, eleven million, nine hundred seventy-one thousand, one hundred ninety-seven".