261308741522 has 4 divisors (see below), whose sum is σ = 391963112286. Its totient is φ = 130654370760.

The previous prime is 261308741443. The next prime is 261308741537. The reversal of 261308741522 is 225147803162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 225147803162 = 2 ⋅112573901581.

It can be written as a sum of positive squares in only one way, i.e., 177671523121 + 83637218401 = 421511^2 + 289201^2 .

It is a super-2 number, since 2×261308741522² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261308741522.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65327185379 + ... + 65327185382.

Almost surely, 2^261308741522 is an apocalyptic number.

261308741522 is a deficient number, since it is larger than the sum of its proper divisors (130654370764).

261308741522 is a wasteful number, since it uses less digits than its factorization.

261308741522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130654370763.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 261308741522 in words is "two hundred sixty-one billion, three hundred eight million, seven hundred forty-one thousand, five hundred twenty-two".