11778535501 has 2 divisors, whose sum is σ = 11778535502. Its totient is φ = 11778535500.

The previous prime is 11778535481. The next prime is 11778535511. The reversal of 11778535501 is 10553587711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11772033001 + 6502500 = 108499^2 + 2550^2 .

It is a cyclic number.

It is not a de Polignac number, because 11778535501 - 2²³ = 11770146893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11778535511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5889267750 + 5889267751.

It is an arithmetic number, because the mean of its divisors is an integer number (5889267751).

Almost surely, 2^11778535501 is an apocalyptic number.

It is an amenable number.

11778535501 is a deficient number, since it is larger than the sum of its proper divisors (1).

11778535501 is an equidigital number, since it uses as much as digits as its factorization.

11778535501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147000, while the sum is 43.

The spelling of 11778535501 in words is "eleven billion, seven hundred seventy-eight million, five hundred thirty-five thousand, five hundred one".