61051501565 has 8 divisors (see below), whose sum is σ = 73263250008. Its totient is φ = 48840235840.

The previous prime is 61051501559. The next prime is 61051501573. The reversal of 61051501565 is 56510515016.

It can be written as a sum of positive squares in 4 ways, for example, as 740982841 + 60310518724 = 27221^2 + 245582^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61051501565 - 2¹⁴ = 61051485181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276275 + ... + 445455.

It is an arithmetic number, because the mean of its divisors is an integer number (9157906251).

Almost surely, 2^61051501565 is an apocalyptic number.

It is an amenable number.

61051501565 is a deficient number, since it is larger than the sum of its proper divisors (12211748443).

61051501565 is a wasteful number, since it uses less digits than its factorization.

61051501565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241359.

The product of its (nonzero) digits is 22500, while the sum is 35.

The spelling of 61051501565 in words is "sixty-one billion, fifty-one million, five hundred one thousand, five hundred sixty-five".