61800659567 has 4 divisors (see below), whose sum is σ = 65053325880. Its totient is φ = 58547993256.

The previous prime is 61800659551. The next prime is 61800659581. The reversal of 61800659567 is 76595600816.

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 61800659567 - 2⁴ = 61800659551 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 (61800653567) 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, 1626333128 + ... + 1626333165.

It is an arithmetic number, because the mean of its divisors is an integer number (16263331470).

Almost surely, 2^61800659567 is an apocalyptic number.

61800659567 is a deficient number, since it is larger than the sum of its proper divisors (3252666313).

61800659567 is a wasteful number, since it uses less digits than its factorization.

61800659567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3252666312.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The spelling of 61800659567 in words is "sixty-one billion, eight hundred million, six hundred fifty-nine thousand, five hundred sixty-seven".