261354463406 has 16 divisors (see below), whose sum is σ = 414620712960. Its totient is φ = 123212751480.

The previous prime is 261354463399. The next prime is 261354463459. The reversal of 261354463406 is 604364453162.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16289966 + ... + 16306001.

It is an arithmetic number, because the mean of its divisors is an integer number (25913794560).

Almost surely, 2^261354463406 is an apocalyptic number.

261354463406 is a deficient number, since it is larger than the sum of its proper divisors (153266249554).

261354463406 is a wasteful number, since it uses less digits than its factorization.

261354463406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32596199.

The product of its (nonzero) digits is 1244160, while the sum is 44.

The spelling of 261354463406 in words is "two hundred sixty-one billion, three hundred fifty-four million, four hundred sixty-three thousand, four hundred six".