61244003261 has 4 divisors (see below), whose sum is σ = 69993146592. Its totient is φ = 52494859932.

The previous prime is 61244003239. The next prime is 61244003281. The reversal of 61244003261 is 16230044216.

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 a de Polignac number, because none of the positive numbers 2^k-61244003261 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 (61244003221) 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, 4374571655 + ... + 4374571668.

It is an arithmetic number, because the mean of its divisors is an integer number (17498286648).

Almost surely, 2^61244003261 is an apocalyptic number.

It is an amenable number.

61244003261 is a deficient number, since it is larger than the sum of its proper divisors (8749143331).

61244003261 is an equidigital number, since it uses as much as digits as its factorization.

61244003261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8749143330.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 61244003261 its reverse (16230044216), we get a palindrome (77474047477).

The spelling of 61244003261 in words is "sixty-one billion, two hundred forty-four million, three thousand, two hundred sixty-one".