121762441551 has 4 divisors (see below), whose sum is σ = 162349922072. Its totient is φ = 81174961032.

The previous prime is 121762441519. The next prime is 121762441553. The reversal of 121762441551 is 155144267121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155144267121 = 3 ⋅51714755707.

It is not a de Polignac number, because 121762441551 - 2⁵ = 121762441519 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 (121762441553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20293740256 + ... + 20293740261.

It is an arithmetic number, because the mean of its divisors is an integer number (40587480518).

Almost surely, 2^121762441551 is an apocalyptic number.

121762441551 is a deficient number, since it is larger than the sum of its proper divisors (40587480521).

121762441551 is an equidigital number, since it uses as much as digits as its factorization.

121762441551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40587480520.

The product of its digits is 67200, while the sum is 39.

The spelling of 121762441551 in words is "one hundred twenty-one billion, seven hundred sixty-two million, four hundred forty-one thousand, five hundred fifty-one".