11661791025 has 96 divisors (see below), whose sum is σ = 21355776000. Its totient is φ = 5591496960.

The previous prime is 11661791023. The next prime is 11661791051. The reversal of 11661791025 is 52019716611.

It is not a de Polignac number, because 11661791025 - 2¹ = 11661791023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11661791023) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2435784 + ... + 2440566.

It is an arithmetic number, because the mean of its divisors is an integer number (222456000).

Almost surely, 2^11661791025 is an apocalyptic number.

11661791025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11661791025 is a deficient number, since it is larger than the sum of its proper divisors (9693984975).

11661791025 is a wasteful number, since it uses less digits than its factorization.

11661791025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4903 (or 4898 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 39.

The spelling of 11661791025 in words is "eleven billion, six hundred sixty-one million, seven hundred ninety-one thousand, twenty-five".