121761605477 has 8 divisors (see below), whose sum is σ = 129260676096. Its totient is φ = 114299937472.

The previous prime is 121761605461. The next prime is 121761605489. The reversal of 121761605477 is 774506167121.

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 121761605477 - 2⁴ = 121761605461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121761635477) 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, 9343943 + ... + 9356964.

It is an arithmetic number, because the mean of its divisors is an integer number (16157584512).

Almost surely, 2^121761605477 is an apocalyptic number.

121761605477 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

121761605477 is a deficient number, since it is larger than the sum of its proper divisors (7499070619).

121761605477 is a wasteful number, since it uses less digits than its factorization.

121761605477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18701307.

The product of its (nonzero) digits is 493920, while the sum is 47.

The spelling of 121761605477 in words is "one hundred twenty-one billion, seven hundred sixty-one million, six hundred five thousand, four hundred seventy-seven".