61613432155257 has 4 divisors (see below), whose sum is σ = 82151242873680. Its totient is φ = 41075621436836.

The previous prime is 61613432155237. The next prime is 61613432155309. The reversal of 61613432155257 is 75255123431616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61613432155257 - 2²⁰ = 61613431106681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61613432155237) 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, 10268905359207 + ... + 10268905359212.

It is an arithmetic number, because the mean of its divisors is an integer number (20537810718420).

Almost surely, 2^{61613432155257} is an apocalyptic number.

It is an amenable number.

61613432155257 is a deficient number, since it is larger than the sum of its proper divisors (20537810718423).

61613432155257 is a wasteful number, since it uses less digits than its factorization.

61613432155257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20537810718422.

The product of its digits is 4536000, while the sum is 51.

The spelling of 61613432155257 in words is "sixty-one trillion, six hundred thirteen billion, four hundred thirty-two million, one hundred fifty-five thousand, two hundred fifty-seven".