261430431331526 has 8 divisors (see below), whose sum is σ = 395615962457784. Its totient is φ = 129558443845600.

The previous prime is 261430431331417. The next prime is 261430431331607. The reversal of 261430431331526 is 625133134034162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578385909800 + ... + 578385910251.

It is an arithmetic number, because the mean of its divisors is an integer number (49451995307223).

Almost surely, 2^{261430431331526} is an apocalyptic number.

261430431331526 is a deficient number, since it is larger than the sum of its proper divisors (134185531126258).

261430431331526 is a wasteful number, since it uses less digits than its factorization.

261430431331526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156771820166.

The product of its (nonzero) digits is 933120, while the sum is 44.

Adding to 261430431331526 its reverse (625133134034162), we get a palindrome (886563565365688).

The spelling of 261430431331526 in words is "two hundred sixty-one trillion, four hundred thirty billion, four hundred thirty-one million, three hundred thirty-one thousand, five hundred twenty-six".