11969428785 has 16 divisors (see below), whose sum is σ = 19174432320. Its totient is φ = 6375913280.

The previous prime is 11969428777. The next prime is 11969428789. The reversal of 11969428785 is 58782496911.

It is not a de Polignac number, because 11969428785 - 2³ = 11969428777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11969428789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 473655 + ... + 498284.

It is an arithmetic number, because the mean of its divisors is an integer number (1198402020).

Almost surely, 2^11969428785 is an apocalyptic number.

11969428785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11969428785 is a deficient number, since it is larger than the sum of its proper divisors (7205003535).

11969428785 is an equidigital number, since it uses as much as digits as its factorization.

11969428785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972768.

The product of its digits is 8709120, while the sum is 60.

The spelling of 11969428785 in words is "eleven billion, nine hundred sixty-nine million, four hundred twenty-eight thousand, seven hundred eighty-five".