61111000550 has 72 divisors (see below), whose sum is σ = 120114468432. Its totient is φ = 23128776000.

The previous prime is 61111000547. The next prime is 61111000553. The reversal of 61111000550 is 5500011116.

It is an interprime number because it is at equal distance from previous prime (61111000547) and next prime (61111000553).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61111000553) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 19149455 + ... + 19152645.

It is an arithmetic number, because the mean of its divisors is an integer number (1668256506).

Almost surely, 2^61111000550 is an apocalyptic number.

61111000550 is a deficient number, since it is larger than the sum of its proper divisors (59003467882).

61111000550 is a wasteful number, since it uses less digits than its factorization.

61111000550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4302 (or 4278 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 20.

Adding to 61111000550 its reverse (5500011116), we get a palindrome (66611011666).

The spelling of 61111000550 in words is "sixty-one billion, one hundred eleven million, five hundred fifty", and thus it is an aban number.