261008010623 has 4 divisors (see below), whose sum is σ = 274745274360. Its totient is φ = 247270746888.

The previous prime is 261008010587. The next prime is 261008010643. The reversal of 261008010623 is 326010800162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326010800162 = 2 ⋅163005400081.

It is a cyclic number.

It is not a de Polignac number, because 261008010623 - 2⁶ = 261008010559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261008010643) 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, 6868631840 + ... + 6868631877.

It is an arithmetic number, because the mean of its divisors is an integer number (68686318590).

Almost surely, 2^261008010623 is an apocalyptic number.

261008010623 is a deficient number, since it is larger than the sum of its proper divisors (13737263737).

261008010623 is a wasteful number, since it uses less digits than its factorization.

261008010623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13737263736.

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 261008010623 its reverse (326010800162), we get a palindrome (587018810785).

The spelling of 261008010623 in words is "two hundred sixty-one billion, eight million, ten thousand, six hundred twenty-three".