61661460042653 has 4 divisors (see below), whose sum is σ = 61690422684540. Its totient is φ = 61632497400768.

The previous prime is 61661460042649. The next prime is 61661460042701. The reversal of 61661460042653 is 35624006416616.

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 39601886758009 + 22059573284644 = 6293003^2 + 4696762^2 .

It is a cyclic number.

It is not a de Polignac number, because 61661460042653 - 2² = 61661460042649 is a prime.

It is a super-3 number, since 3×61661460042653³ (a number of 42 digits) contains 333 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 (61661460542653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14481317750 + ... + 14481322007.

It is an arithmetic number, because the mean of its divisors is an integer number (15422605671135).

Almost surely, 2^{61661460042653} is an apocalyptic number.

It is an amenable number.

61661460042653 is a deficient number, since it is larger than the sum of its proper divisors (28962641887).

61661460042653 is a wasteful number, since it uses less digits than its factorization.

61661460042653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28962641886.

The product of its (nonzero) digits is 3732480, while the sum is 50.

The spelling of 61661460042653 in words is "sixty-one trillion, six hundred sixty-one billion, four hundred sixty million, forty-two thousand, six hundred fifty-three".