261745464118 has 16 divisors (see below), whose sum is σ = 395680793904. Its totient is φ = 129852197280.

The previous prime is 261745464103. The next prime is 261745464157. The reversal of 261745464118 is 811464547162.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1564996 + ... + 1724152.

It is an arithmetic number, because the mean of its divisors is an integer number (24730049619).

Almost surely, 2^261745464118 is an apocalyptic number.

261745464118 is a deficient number, since it is larger than the sum of its proper divisors (133935329786).

261745464118 is a wasteful number, since it uses less digits than its factorization.

261745464118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165567.

The product of its digits is 1290240, while the sum is 49.

The spelling of 261745464118 in words is "two hundred sixty-one billion, seven hundred forty-five million, four hundred sixty-four thousand, one hundred eighteen".