121761544516 has 6 divisors (see below), whose sum is σ = 213082702910. Its totient is φ = 60880772256.

The previous prime is 121761544511. The next prime is 121761544537. The reversal of 121761544516 is 615445167121.

It can be written as a sum of positive squares in only one way, i.e., 120203663616 + 1557880900 = 346704^2 + 39470^2 .

It is not an unprimeable number, because it can be changed into a prime (121761544511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15220193061 + ... + 15220193068.

Almost surely, 2^121761544516 is an apocalyptic number.

It is an amenable number.

121761544516 is a deficient number, since it is larger than the sum of its proper divisors (91321158394).

121761544516 is a wasteful number, since it uses less digits than its factorization.

121761544516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30440386133 (or 30440386131 counting only the distinct ones).

The product of its digits is 201600, while the sum is 43.

The spelling of 121761544516 in words is "one hundred twenty-one billion, seven hundred sixty-one million, five hundred forty-four thousand, five hundred sixteen".