121879587650 has 24 divisors (see below), whose sum is σ = 226854363204. Its totient is φ = 48717785600.

The previous prime is 121879587611. The next prime is 121879587667. The reversal of 121879587650 is 56785978121.

It can be written as a sum of positive squares in 6 ways, for example, as 105611350441 + 16268237209 = 324979^2 + 127547^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121879587650.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 778871 + ... + 922170.

Almost surely, 2^121879587650 is an apocalyptic number.

121879587650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121879587650 is a deficient number, since it is larger than the sum of its proper divisors (104974775554).

121879587650 is a wasteful number, since it uses less digits than its factorization.

121879587650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702486 (or 1702481 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 59.

The spelling of 121879587650 in words is "one hundred twenty-one billion, eight hundred seventy-nine million, five hundred eighty-seven thousand, six hundred fifty".