261205513534 has 48 divisors (see below), whose sum is σ = 475701616800. Its totient is φ = 107053664256.

The previous prime is 261205513523. The next prime is 261205513577. The reversal of 261205513534 is 435315502162.

It is a junction number, because it is equal to n+sod(n) for n = 261205513493 and 261205513502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12542122 + ... + 12562930.

It is an arithmetic number, because the mean of its divisors is an integer number (9910450350).

Almost surely, 2^261205513534 is an apocalyptic number.

261205513534 is a deficient number, since it is larger than the sum of its proper divisors (214496103266).

261205513534 is a wasteful number, since it uses less digits than its factorization.

261205513534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26417 (or 26410 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 261205513534 in words is "two hundred sixty-one billion, two hundred five million, five hundred thirteen thousand, five hundred thirty-four".