61801610815 has 8 divisors (see below), whose sum is σ = 84756494880. Its totient is φ = 42378247392.

The previous prime is 61801610797. The next prime is 61801610867. The reversal of 61801610815 is 51801610816.

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 61801610815 - 2²⁹ = 61264739903 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 882880120 + ... + 882880189.

It is an arithmetic number, because the mean of its divisors is an integer number (10594561860).

Almost surely, 2^61801610815 is an apocalyptic number.

61801610815 is a deficient number, since it is larger than the sum of its proper divisors (22954884065).

61801610815 is a wasteful number, since it uses less digits than its factorization.

61801610815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765760321.

The product of its (nonzero) digits is 11520, while the sum is 37.

Subtracting from 61801610815 its reverse (51801610816), we obtain a palindrome (9999999999).

The spelling of 61801610815 in words is "sixty-one billion, eight hundred one million, six hundred ten thousand, eight hundred fifteen".