261564948708 has 24 divisors (see below), whose sum is σ = 697506530112. Its totient is φ = 74732842464.

The previous prime is 261564948707. The next prime is 261564948709. The reversal of 261564948708 is 807849465162.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (261564948707) and next prime (261564948709).

It is not an unprimeable number, because it can be changed into a prime (261564948703) 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, 1556934135 + ... + 1556934302.

It is an arithmetic number, because the mean of its divisors is an integer number (29062772088).

Almost surely, 2^261564948708 is an apocalyptic number.

261564948708 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

261564948708 is an abundant number, since it is smaller than the sum of its proper divisors (435941581404).

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

261564948708 is a wasteful number, since it uses less digits than its factorization.

261564948708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113868451 (or 3113868449 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 60.

The spelling of 261564948708 in words is "two hundred sixty-one billion, five hundred sixty-four million, nine hundred forty-eight thousand, seven hundred eight".