11651951893 has 2 divisors, whose sum is σ = 11651951894. Its totient is φ = 11651951892.

The previous prime is 11651951891. The next prime is 11651951923. The reversal of 11651951893 is 39815915611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10814544049 + 837407844 = 103993^2 + 28938^2 .

It is a cyclic number.

It is not a de Polignac number, because 11651951893 - 2¹ = 11651951891 is a prime.

Together with 11651951891, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11651951891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5825975946 + 5825975947.

It is an arithmetic number, because the mean of its divisors is an integer number (5825975947).

Almost surely, 2^11651951893 is an apocalyptic number.

It is an amenable number.

11651951893 is a deficient number, since it is larger than the sum of its proper divisors (1).

11651951893 is an equidigital number, since it uses as much as digits as its factorization.

11651951893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 49.

The spelling of 11651951893 in words is "eleven billion, six hundred fifty-one million, nine hundred fifty-one thousand, eight hundred ninety-three".