121366361026640 has 20 divisors (see below), whose sum is σ = 282176789387124. Its totient is φ = 48546544410624.

The previous prime is 121366361026543. The next prime is 121366361026711. The reversal of 121366361026640 is 46620163663121.

It can be written as a sum of positive squares in 2 ways, for example, as 84308169074704 + 37058191951936 = 9181948^2 + 6087544^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758539756337 + ... + 758539756496.

Almost surely, 2^{121366361026640} is an apocalyptic number.

121366361026640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121366361026640 is an abundant number, since it is smaller than the sum of its proper divisors (160810428360484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121366361026640 is a wasteful number, since it uses less digits than its factorization.

121366361026640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517079512846 (or 1517079512840 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 47.

The spelling of 121366361026640 in words is "one hundred twenty-one trillion, three hundred sixty-six billion, three hundred sixty-one million, twenty-six thousand, six hundred forty".