261337222064 has 10 divisors (see below), whose sum is σ = 506340867780. Its totient is φ = 130668611024.

The previous prime is 261337222061. The next prime is 261337222093. The reversal of 261337222064 is 460222733162.

It is a super-2 number, since 2×261337222064² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261337222061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8166788174 + ... + 8166788205.

It is an arithmetic number, because the mean of its divisors is an integer number (50634086778).

Almost surely, 2^261337222064 is an apocalyptic number.

It is an amenable number.

261337222064 is a deficient number, since it is larger than the sum of its proper divisors (245003645716).

261337222064 is a wasteful number, since it uses less digits than its factorization.

261337222064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16333576387 (or 16333576381 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 38.

The spelling of 261337222064 in words is "two hundred sixty-one billion, three hundred thirty-seven million, two hundred twenty-two thousand, sixty-four".