261035627897 has 4 divisors (see below), whose sum is σ = 284766139536. Its totient is φ = 237305116260.

The previous prime is 261035627857. The next prime is 261035627903. The reversal of 261035627897 is 798726530162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261035627897 - 2⁶ = 261035627833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261035627857) 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, 11865255803 + ... + 11865255824.

It is an arithmetic number, because the mean of its divisors is an integer number (71191534884).

Almost surely, 2^261035627897 is an apocalyptic number.

It is an amenable number.

261035627897 is a deficient number, since it is larger than the sum of its proper divisors (23730511639).

261035627897 is a wasteful number, since it uses less digits than its factorization.

261035627897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23730511638.

The product of its (nonzero) digits is 7620480, while the sum is 56.

The spelling of 261035627897 in words is "two hundred sixty-one billion, thirty-five million, six hundred twenty-seven thousand, eight hundred ninety-seven".