121788167761 has 8 divisors (see below), whose sum is σ = 131165241704. Its totient is φ = 112412344320.

The previous prime is 121788167759. The next prime is 121788167771. The reversal of 121788167761 is 167761887121.

It can be written as a sum of positive squares in 4 ways, for example, as 21136798225 + 100651369536 = 145385^2 + 317256^2 .

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 121788167761 - 2¹ = 121788167759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121788167771) 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, 105246 + ... + 504631.

It is an arithmetic number, because the mean of its divisors is an integer number (16395655213).

Almost surely, 2^121788167761 is an apocalyptic number.

It is an amenable number.

121788167761 is a deficient number, since it is larger than the sum of its proper divisors (9377073943).

121788167761 is a wasteful number, since it uses less digits than its factorization.

121788167761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625251.

The product of its digits is 1580544, while the sum is 55.

The spelling of 121788167761 in words is "one hundred twenty-one billion, seven hundred eighty-eight million, one hundred sixty-seven thousand, seven hundred sixty-one".