61155006565657 has 4 divisors (see below), whose sum is σ = 61157132172496. Its totient is φ = 61152880958820.

The previous prime is 61155006565651. The next prime is 61155006565669. The reversal of 61155006565657 is 75656560055116.

It is a happy number.

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 61155006565657 - 2¹⁵ = 61155006532889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61155006565651) 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, 1062760263 + ... + 1062817804.

It is an arithmetic number, because the mean of its divisors is an integer number (15289283043124).

Almost surely, 2^{61155006565657} is an apocalyptic number.

It is an amenable number.

61155006565657 is a deficient number, since it is larger than the sum of its proper divisors (2125606839).

61155006565657 is a wasteful number, since it uses less digits than its factorization.

61155006565657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125606838.

The product of its (nonzero) digits is 28350000, while the sum is 58.

The spelling of 61155006565657 in words is "sixty-one trillion, one hundred fifty-five billion, six million, five hundred sixty-five thousand, six hundred fifty-seven".