61000665105550 has 48 divisors (see below), whose sum is σ = 114360850414800. Its totient is φ = 24207196885760.

The previous prime is 61000665105521. The next prime is 61000665105551. The reversal of 61000665105550 is 5550156600016.

It is a super-2 number, since 2×61000665105550² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61000665105551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1210722 + ... + 11111578.

It is an arithmetic number, because the mean of its divisors is an integer number (2382517716975).

Almost surely, 2^{61000665105550} is an apocalyptic number.

61000665105550 is a deficient number, since it is larger than the sum of its proper divisors (53360185309250).

61000665105550 is a wasteful number, since it uses less digits than its factorization.

61000665105550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9901845 (or 9901840 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 61000665105550 in words is "sixty-one trillion, six hundred sixty-five million, one hundred five thousand, five hundred fifty".