11778506531 has 8 divisors (see below), whose sum is σ = 13059924528. Its totient is φ = 10532196000.

The previous prime is 11778506521. The next prime is 11778506539. The reversal of 11778506531 is 13560587711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11778506531 - 2²⁶ = 11711397667 is a prime.

It is a super-2 number, since 2×11778506531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11778506539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8776160 + ... + 8777501.

It is an arithmetic number, because the mean of its divisors is an integer number (1632490566).

Almost surely, 2^11778506531 is an apocalyptic number.

11778506531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11778506531 is a deficient number, since it is larger than the sum of its proper divisors (1281417997).

11778506531 is a wasteful number, since it uses less digits than its factorization.

11778506531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17553733.

The product of its (nonzero) digits is 176400, while the sum is 44.

The spelling of 11778506531 in words is "eleven billion, seven hundred seventy-eight million, five hundred six thousand, five hundred thirty-one".