261654075964 has 24 divisors (see below), whose sum is σ = 482028477840. Its totient is φ = 123932628864.

The previous prime is 261654075959. The next prime is 261654075967. The reversal of 261654075964 is 469570456162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261654075967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1029672 + ... + 1258384.

It is an arithmetic number, because the mean of its divisors is an integer number (20084519910).

Almost surely, 2^261654075964 is an apocalyptic number.

It is an amenable number.

261654075964 is a deficient number, since it is larger than the sum of its proper divisors (220374401876).

261654075964 is a wasteful number, since it uses less digits than its factorization.

261654075964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243789 (or 243787 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 55.

The spelling of 261654075964 in words is "two hundred sixty-one billion, six hundred fifty-four million, seventy-five thousand, nine hundred sixty-four".