261772347264121 has 8 divisors (see below), whose sum is σ = 262510819569440. Its totient is φ = 261034823544768.

The previous prime is 261772347264067. The next prime is 261772347264191. The reversal of 261772347264121 is 121462743277162.

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 261772347264121 - 2¹⁹ = 261772346739833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261772347264191) 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, 236593791 + ... + 237697636.

It is an arithmetic number, because the mean of its divisors is an integer number (32813852446180).

Almost surely, 2^{261772347264121} is an apocalyptic number.

It is an amenable number.

261772347264121 is a deficient number, since it is larger than the sum of its proper divisors (738472305319).

261772347264121 is a wasteful number, since it uses less digits than its factorization.

261772347264121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474292983.

The product of its digits is 9483264, while the sum is 55.

The spelling of 261772347264121 in words is "two hundred sixty-one trillion, seven hundred seventy-two billion, three hundred forty-seven million, two hundred sixty-four thousand, one hundred twenty-one".