121686554896 has 45 divisors (see below), whose sum is σ = 242414867919. Its totient is φ = 59173748352.

The previous prime is 121686554837. The next prime is 121686554923. The reversal of 121686554896 is 698455686121.

The square root of 121686554896 is 348836.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1471796496 + 120214758400 = 38364^2 + 346720^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 51626550 + ... + 51628906.

Almost surely, 2^121686554896 is an apocalyptic number.

121686554896 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

121686554896 is the 348836-th square number.

It is an amenable number.

121686554896 is a deficient number, since it is larger than the sum of its proper divisors (120728313023).

121686554896 is an frugal number, since it uses more digits than its factorization.

121686554896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4796 (or 2396 counting only the distinct ones).

The product of its digits is 24883200, while the sum is 61.

The spelling of 121686554896 in words is "one hundred twenty-one billion, six hundred eighty-six million, five hundred fifty-four thousand, eight hundred ninety-six".