61061600161655 has 4 divisors (see below), whose sum is σ = 73273920193992. Its totient is φ = 48849280129320.

The previous prime is 61061600161619. The next prime is 61061600161687. The reversal of 61061600161655 is 55616100616016.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-61061600161655 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 3 ways as a sum of consecutive naturals, for example, 6106160016161 + ... + 6106160016170.

It is an arithmetic number, because the mean of its divisors is an integer number (18318480048498).

Almost surely, 2^{61061600161655} is an apocalyptic number.

61061600161655 is a deficient number, since it is larger than the sum of its proper divisors (12212320032337).

61061600161655 is a wasteful number, since it uses less digits than its factorization.

61061600161655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12212320032336.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 61061600161655 in words is "sixty-one trillion, sixty-one billion, six hundred million, one hundred sixty-one thousand, six hundred fifty-five".