61111000551 has 16 divisors (see below), whose sum is σ = 82544924160. Its totient is φ = 40209274560.

The previous prime is 61111000547. The next prime is 61111000553. The reversal of 61111000551 is 15500011116.

It is a happy number.

It is not a de Polignac number, because 61111000551 - 2² = 61111000547 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 575056 + ... + 672986.

It is an arithmetic number, because the mean of its divisors is an integer number (5159057760).

Almost surely, 2^61111000551 is an apocalyptic number.

61111000551 is a deficient number, since it is larger than the sum of its proper divisors (21433923609).

61111000551 is a wasteful number, since it uses less digits than its factorization.

61111000551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100646.

The product of its (nonzero) digits is 150, while the sum is 21.

Adding to 61111000551 its reverse (15500011116), we get a palindrome (76611011667).

The spelling of 61111000551 in words is "sixty-one billion, one hundred eleven million, five hundred fifty-one", and thus it is an aban number.