121577520669 has 16 divisors (see below), whose sum is σ = 181619492160. Its totient is φ = 71691903360.

The previous prime is 121577520667. The next prime is 121577520689. The reversal of 121577520669 is 966025775121.

It is not a de Polignac number, because 121577520669 - 2¹ = 121577520667 is a prime.

It is a super-2 number, since 2×121577520669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121577520667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49784824 + ... + 49787265.

It is an arithmetic number, because the mean of its divisors is an integer number (11351218260).

Almost surely, 2^121577520669 is an apocalyptic number.

It is an amenable number.

121577520669 is a deficient number, since it is larger than the sum of its proper divisors (60041971491).

121577520669 is a wasteful number, since it uses less digits than its factorization.

121577520669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99572140.

The product of its (nonzero) digits is 1587600, while the sum is 51.

It can be divided in two parts, 121577 and 520669, that added together give a palindrome (642246).

The spelling of 121577520669 in words is "one hundred twenty-one billion, five hundred seventy-seven million, five hundred twenty thousand, six hundred sixty-nine".