121151356661 has 2 divisors, whose sum is σ = 121151356662. Its totient is φ = 121151356660.

The previous prime is 121151356657. The next prime is 121151356679. The reversal of 121151356661 is 166653151121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102384000625 + 18767356036 = 319975^2 + 136994^2 .

It is a cyclic number.

It is not a de Polignac number, because 121151356661 - 2² = 121151356657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121151356621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60575678330 + 60575678331.

It is an arithmetic number, because the mean of its divisors is an integer number (60575678331).

Almost surely, 2^121151356661 is an apocalyptic number.

It is an amenable number.

121151356661 is a deficient number, since it is larger than the sum of its proper divisors (1).

121151356661 is an equidigital number, since it uses as much as digits as its factorization.

121151356661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 38.

The spelling of 121151356661 in words is "one hundred twenty-one billion, one hundred fifty-one million, three hundred fifty-six thousand, six hundred sixty-one".