61500501065645 has 4 divisors (see below), whose sum is σ = 73800601278780. Its totient is φ = 49200400852512.

The previous prime is 61500501065639. The next prime is 61500501065657. The reversal of 61500501065645 is 54656010500516.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15443280882436 + 46057220183209 = 3929794^2 + 6786547^2 .

It is a cyclic number.

It is not a de Polignac number, because 61500501065645 - 2⁶ = 61500501065581 is a prime.

It is a super-3 number, since 3×61500501065645³ (a number of 42 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61500501065596 and 61500501065605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6150050106560 + ... + 6150050106569.

It is an arithmetic number, because the mean of its divisors is an integer number (18450150319695).

Almost surely, 2^{61500501065645} is an apocalyptic number.

It is an amenable number.

61500501065645 is a deficient number, since it is larger than the sum of its proper divisors (12300100213135).

61500501065645 is a wasteful number, since it uses less digits than its factorization.

61500501065645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12300100213134.

The product of its (nonzero) digits is 540000, while the sum is 44.

The spelling of 61500501065645 in words is "sixty-one trillion, five hundred billion, five hundred one million, sixty-five thousand, six hundred forty-five".