261683720954 has 16 divisors (see below), whose sum is σ = 393646691328. Its totient is φ = 130468251312.

The previous prime is 261683720953. The next prime is 261683720983. The reversal of 261683720954 is 459027386162.

It is a junction number, because it is equal to n+sod(n) for n = 261683720896 and 261683720905.

It is not an unprimeable number, because it can be changed into a prime (261683720951) 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, 7037399 + ... + 7074485.

It is an arithmetic number, because the mean of its divisors is an integer number (24602918208).

It is a 2-persistent number, because it is pandigital, and so is 2⋅261683720954 = 523367441908, but 3⋅261683720954 = 785051162862 is not.

Almost surely, 2^261683720954 is an apocalyptic number.

261683720954 is a deficient number, since it is larger than the sum of its proper divisors (131962970374).

261683720954 is a wasteful number, since it uses less digits than its factorization.

261683720954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47069.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 261683720954 in words is "two hundred sixty-one billion, six hundred eighty-three million, seven hundred twenty thousand, nine hundred fifty-four".