11651656091 has 2 divisors, whose sum is σ = 11651656092. Its totient is φ = 11651656090.

The previous prime is 11651656033. The next prime is 11651656097. The reversal of 11651656091 is 19065615611.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11651656091 is a prime.

It is a super-2 number, since 2×11651656091² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (11651656097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5825828045 + 5825828046.

It is an arithmetic number, because the mean of its divisors is an integer number (5825828046).

Almost surely, 2^11651656091 is an apocalyptic number.

11651656091 is a deficient number, since it is larger than the sum of its proper divisors (1).

11651656091 is an equidigital number, since it uses as much as digits as its factorization.

11651656091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 41.

The spelling of 11651656091 in words is "eleven billion, six hundred fifty-one million, six hundred fifty-six thousand, ninety-one".