61601511655 has 8 divisors (see below), whose sum is σ = 73942758432. Its totient is φ = 49267246368.

The previous prime is 61601511619. The next prime is 61601511659. The reversal of 61601511655 is 55611510616.

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 61601511655 - 2¹⁹ = 61600987367 is a prime.

It is a super-2 number, since 2×61601511655² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61601511659) by changing a digit.

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, 1725939 + ... + 1761268.

It is an arithmetic number, because the mean of its divisors is an integer number (9242844804).

Almost surely, 2^61601511655 is an apocalyptic number.

61601511655 is a deficient number, since it is larger than the sum of its proper divisors (12341246777).

61601511655 is a wasteful number, since it uses less digits than its factorization.

61601511655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3490745.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 61601511655 in words is "sixty-one billion, six hundred one million, five hundred eleven thousand, six hundred fifty-five".