11915011971157 has 4 divisors (see below), whose sum is σ = 12205622019276. Its totient is φ = 11624401923040.

The previous prime is 11915011971119. The next prime is 11915011971229. The reversal of 11915011971157 is 75117911051911.

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 458743417636 + 11456268553521 = 677306^2 + 3384711^2 .

It is a cyclic number.

It is not a de Polignac number, because 11915011971157 - 2²³ = 11915003582549 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 11915011971157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11915011911157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145305023998 + ... + 145305024079.

It is an arithmetic number, because the mean of its divisors is an integer number (3051405504819).

Almost surely, 2^{11915011971157} is an apocalyptic number.

It is an amenable number.

11915011971157 is a deficient number, since it is larger than the sum of its proper divisors (290610048119).

11915011971157 is an equidigital number, since it uses as much as digits as its factorization.

11915011971157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290610048118.

The product of its (nonzero) digits is 99225, while the sum is 49.

The spelling of 11915011971157 in words is "eleven trillion, nine hundred fifteen billion, eleven million, nine hundred seventy-one thousand, one hundred fifty-seven".