121661276577 has 32 divisors (see below), whose sum is σ = 183760917120. Its totient is φ = 71133189120.

The previous prime is 121661276573. The next prime is 121661276591. The reversal of 121661276577 is 775672166121.

It is a happy number.

It is not a de Polignac number, because 121661276577 - 2² = 121661276573 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (121661276573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 970018 + ... + 1088235.

It is an arithmetic number, because the mean of its divisors is an integer number (5742528660).

Almost surely, 2^121661276577 is an apocalyptic number.

121661276577 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

121661276577 is a deficient number, since it is larger than the sum of its proper divisors (62099640543).

121661276577 is a wasteful number, since it uses less digits than its factorization.

121661276577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2058353.

The product of its digits is 1481760, while the sum is 51.

The spelling of 121661276577 in words is "one hundred twenty-one billion, six hundred sixty-one million, two hundred seventy-six thousand, five hundred seventy-seven".