11923678658551 has 12 divisors (see below), whose sum is σ = 13119944934096. Its totient is φ = 10828333466720.

The previous prime is 11923678658531. The next prime is 11923678658557. The reversal of 11923678658551 is 15585687632911.

It is not a de Polignac number, because 11923678658551 - 2¹¹ = 11923678656503 is a prime.

It is a super-2 number, since 2×11923678658551² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11923678658557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51586051 + ... + 51816676.

It is an arithmetic number, because the mean of its divisors is an integer number (1093328744508).

Almost surely, 2^{11923678658551} is an apocalyptic number.

11923678658551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11923678658551 is a deficient number, since it is larger than the sum of its proper divisors (1196266275545).

11923678658551 is a wasteful number, since it uses less digits than its factorization.

11923678658551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103403702 (or 103403691 counting only the distinct ones).

The product of its digits is 108864000, while the sum is 67.

It can be divided in two parts, 119236 and 78658551, that added together give a palindrome (78777787).

The spelling of 11923678658551 in words is "eleven trillion, nine hundred twenty-three billion, six hundred seventy-eight million, six hundred fifty-eight thousand, five hundred fifty-one".