121601677651 has 2 divisors, whose sum is σ = 121601677652. Its totient is φ = 121601677650.

The previous prime is 121601677621. The next prime is 121601677661. The reversal of 121601677651 is 156776106121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121601677651 - 2¹⁵ = 121601644883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121601677598 and 121601677607.

It is not a weakly prime, because it can be changed into another prime (121601677601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60800838825 + 60800838826.

It is an arithmetic number, because the mean of its divisors is an integer number (60800838826).

Almost surely, 2^121601677651 is an apocalyptic number.

121601677651 is a deficient number, since it is larger than the sum of its proper divisors (1).

121601677651 is an equidigital number, since it uses as much as digits as its factorization.

121601677651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 43.

The spelling of 121601677651 in words is "one hundred twenty-one billion, six hundred one million, six hundred seventy-seven thousand, six hundred fifty-one".