261957340506 has 16 divisors (see below), whose sum is σ = 523919698848. Its totient is φ = 87318277200.

The previous prime is 261957340499. The next prime is 261957340511. The reversal of 261957340506 is 605043759162.

261957340506 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 1102501 + ... + 1318871.

It is an arithmetic number, because the mean of its divisors is an integer number (32744981178).

Almost surely, 2^261957340506 is an apocalyptic number.

261957340506 is an abundant number, since it is smaller than the sum of its proper divisors (261962358342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261957340506 is a wasteful number, since it uses less digits than its factorization.

261957340506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418157.

The product of its (nonzero) digits is 1360800, while the sum is 48.

The spelling of 261957340506 in words is "two hundred sixty-one billion, nine hundred fifty-seven million, three hundred forty thousand, five hundred six".