61415521121 has 8 divisors (see below), whose sum is σ = 65368664064. Its totient is φ = 57500207680.

The previous prime is 61415521109. The next prime is 61415521151. The reversal of 61415521121 is 12112551416.

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 61415521121 - 2³⁰ = 60341779297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61415521151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9454025 + ... + 9460518.

It is an arithmetic number, because the mean of its divisors is an integer number (8171083008).

Almost surely, 2^61415521121 is an apocalyptic number.

It is an amenable number.

61415521121 is a deficient number, since it is larger than the sum of its proper divisors (3953142943).

61415521121 is a wasteful number, since it uses less digits than its factorization.

61415521121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18914751.

The product of its digits is 2400, while the sum is 29.

The spelling of 61415521121 in words is "sixty-one billion, four hundred fifteen million, five hundred twenty-one thousand, one hundred twenty-one".