61815749684501 has 8 divisors (see below), whose sum is σ = 61886339844408. Its totient is φ = 61745182744000.

The previous prime is 61815749684461. The next prime is 61815749684551. The reversal of 61815749684501 is 10548694751816.

It can be written as a sum of positive squares in 4 ways, for example, as 11237680630225 + 50578069054276 = 3352265^2 + 7111826^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 61815749684501 - 2¹⁰ = 61815749683477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61815749684551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474530 + ... + 11129091.

It is an arithmetic number, because the mean of its divisors is an integer number (7735792480551).

Almost surely, 2^{61815749684501} is an apocalyptic number.

It is an amenable number.

61815749684501 is a deficient number, since it is larger than the sum of its proper divisors (70590159907).

61815749684501 is a wasteful number, since it uses less digits than its factorization.

61815749684501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11609703.

The product of its (nonzero) digits is 58060800, while the sum is 65.

The spelling of 61815749684501 in words is "sixty-one trillion, eight hundred fifteen billion, seven hundred forty-nine million, six hundred eighty-four thousand, five hundred one".