11858778731 has 8 divisors (see below), whose sum is σ = 12566706000. Its totient is φ = 11159229600.

The previous prime is 11858778713. The next prime is 11858778733. The reversal of 11858778731 is 13787785811.

It is a happy number.

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 11858778731 - 2¹⁴ = 11858762347 is a prime.

It is a super-2 number, since 2×11858778731² (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 (11858778733) 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, 2091620 + ... + 2097281.

It is an arithmetic number, because the mean of its divisors is an integer number (1570838250).

Almost surely, 2^11858778731 is an apocalyptic number.

11858778731 is a deficient number, since it is larger than the sum of its proper divisors (707927269).

11858778731 is a wasteful number, since it uses less digits than its factorization.

11858778731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4189069.

The product of its digits is 2634240, while the sum is 56.

The spelling of 11858778731 in words is "eleven billion, eight hundred fifty-eight million, seven hundred seventy-eight thousand, seven hundred thirty-one".