261534400115507 has 4 divisors (see below), whose sum is σ = 261534439859400. Its totient is φ = 261534360371616.

The previous prime is 261534400115491. The next prime is 261534400115519. The reversal of 261534400115507 is 705511004435162.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261534400115507 - 2⁴ = 261534400115491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261534400135507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7386257 + ... + 24033842.

It is an arithmetic number, because the mean of its divisors is an integer number (65383609964850).

Almost surely, 2^{261534400115507} is an apocalyptic number.

261534400115507 is a deficient number, since it is larger than the sum of its proper divisors (39743893).

261534400115507 is an equidigital number, since it uses as much as digits as its factorization.

261534400115507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39743892.

The product of its (nonzero) digits is 504000, while the sum is 44.

The spelling of 261534400115507 in words is "two hundred sixty-one trillion, five hundred thirty-four billion, four hundred million, one hundred fifteen thousand, five hundred seven".