61100100550 has 24 divisors (see below), whose sum is σ = 113685286176. Its totient is φ = 24431631840.

The previous prime is 61100100547. The next prime is 61100100559. The reversal of 61100100550 is 5500100116.

It is a super-2 number, since 2×61100100550² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61100100559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62397 + ... + 355096.

It is an arithmetic number, because the mean of its divisors is an integer number (4736886924).

Almost surely, 2^61100100550 is an apocalyptic number.

61100100550 is a deficient number, since it is larger than the sum of its proper divisors (52585185626).

61100100550 is a wasteful number, since it uses less digits than its factorization.

61100100550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420432 (or 420427 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 19.

Adding to 61100100550 its reverse (5500100116), we get a palindrome (66600200666).

The spelling of 61100100550 in words is "sixty-one billion, one hundred million, one hundred thousand, five hundred fifty".