261430473607545 has 96 divisors (see below), whose sum is σ = 488223334287360. Its totient is φ = 118439779138560.

The previous prime is 261430473607543. The next prime is 261430473607571. The reversal of 261430473607545 is 545706374034162.

It is a happy number.

It is not a de Polignac number, because 261430473607545 - 2¹ = 261430473607543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261430473607543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 13092817 + ... + 26349246.

It is an arithmetic number, because the mean of its divisors is an integer number (5085659732160).

Almost surely, 2^{261430473607545} is an apocalyptic number.

It is an amenable number.

261430473607545 is a deficient number, since it is larger than the sum of its proper divisors (226792860679815).

261430473607545 is a wasteful number, since it uses less digits than its factorization.

261430473607545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39442255 (or 39442238 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 57.

The spelling of 261430473607545 in words is "two hundred sixty-one trillion, four hundred thirty billion, four hundred seventy-three million, six hundred seven thousand, five hundred forty-five".