261506623614550 has 48 divisors (see below), whose sum is σ = 490180092372432. Its totient is φ = 103790436339200.

The previous prime is 261506623614529. The next prime is 261506623614553. The reversal of 261506623614550 is 55416326605162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261506623614553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46994754 + ... + 52263946.

It is an arithmetic number, because the mean of its divisors is an integer number (10212085257759).

Almost surely, 2^{261506623614550} is an apocalyptic number.

261506623614550 is a deficient number, since it is larger than the sum of its proper divisors (228673468757882).

261506623614550 is a wasteful number, since it uses less digits than its factorization.

261506623614550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5276913 (or 5276908 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 52.

The spelling of 261506623614550 in words is "two hundred sixty-one trillion, five hundred six billion, six hundred twenty-three million, six hundred fourteen thousand, five hundred fifty".