11901779947 has 2 divisors, whose sum is σ = 11901779948. Its totient is φ = 11901779946.

The previous prime is 11901779927. The next prime is 11901779959. The reversal of 11901779947 is 74997710911.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11901779947 - 2⁷ = 11901779819 is a prime.

It is a super-3 number, since 3×11901779947³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (11901779927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5950889973 + 5950889974.

It is an arithmetic number, because the mean of its divisors is an integer number (5950889974).

Almost surely, 2^11901779947 is an apocalyptic number.

11901779947 is a deficient number, since it is larger than the sum of its proper divisors (1).

11901779947 is an equidigital number, since it uses as much as digits as its factorization.

11901779947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1000188, while the sum is 55.

The spelling of 11901779947 in words is "eleven billion, nine hundred one million, seven hundred seventy-nine thousand, nine hundred forty-seven".